diff --git a/locale/fr/LC_MESSAGES/tiramisu.po b/locale/fr/LC_MESSAGES/tiramisu.po
index e690849..4ab1976 100644
--- a/locale/fr/LC_MESSAGES/tiramisu.po
+++ b/locale/fr/LC_MESSAGES/tiramisu.po
@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Tiramisu\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-05-12 09:04+0200\n"
+"POT-Creation-Date: 2025-09-19 22:03+0200\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Emmanuel Garette <egarette@cadoles.com>\n"
 "Language-Team: Tiramisu's team <egarette@cadoles.com>\n"
@@ -11,46 +11,46 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
-"X-Generator: Poedit 3.5\n"
+"X-Generator: Poedit 3.7\n"
 "X-Poedit-SourceCharset: UTF-8\n"
 
-#: tiramisu/api.py:79
+#: tiramisu/api.py:86
 msgid "Settings:"
 msgstr "Paramètres :"
 
-#: tiramisu/api.py:83
+#: tiramisu/api.py:90
 msgid "Access to option without verifying permissive properties"
 msgstr "Accès à une option sans vérifié les propriétés permises"
 
-#: tiramisu/api.py:88
+#: tiramisu/api.py:95
 msgid "Access to option without property restriction"
 msgstr "Accès à une option sans restriction de propriété"
 
-#: tiramisu/api.py:93
+#: tiramisu/api.py:100
 msgid "Do not warnings during validation"
 msgstr "Ne peut avoir de warnings durant une validation"
 
-#: tiramisu/api.py:97
+#: tiramisu/api.py:104
 msgid "Commands:"
 msgstr "Commandes :"
 
-#: tiramisu/api.py:111 tiramisu/api.py:1857
+#: tiramisu/api.py:118 tiramisu/api.py:1955
 msgid "please specify a valid sub function ({0}.{1})"
 msgstr "veuillez spécifier une sous fonction valide ({0}.{1})"
 
-#: tiramisu/api.py:196
+#: tiramisu/api.py:206
 msgid "please do not specify index ({0}.{1})"
 msgstr "veuillez ne pas spécifier d'index ({0}.{1})"
 
-#: tiramisu/api.py:201 tiramisu/api.py:856
+#: tiramisu/api.py:211 tiramisu/api.py:940
 msgid "please specify index with a follower option ({0}.{1})"
 msgstr "veuillez spécifier un index avec une option suiveuse ({0}.{1})"
 
-#: tiramisu/api.py:222
+#: tiramisu/api.py:234
 msgid "please specify a valid sub function ({0}.{1}): {2}"
 msgstr "veuillez spécifier une sous fonction valide ({0}.{1}): {2}"
 
-#: tiramisu/api.py:446
+#: tiramisu/api.py:525
 msgid ""
 "the option {0} is not a dynamic option, cannot get identifiers with "
 "only_self parameter to True"
@@ -58,15 +58,15 @@ msgstr ""
 "l'option {0} n'est pas une option dynamique, ne peut retrouver l'identifiant "
 "avec le paramètre only_self à True"
 
-#: tiramisu/api.py:532
+#: tiramisu/api.py:613
 msgid "cannot get option from a follower symlink without index"
 msgstr "ne peut avoir d'option pour une symlink suiveuse sans index"
 
-#: tiramisu/api.py:607
+#: tiramisu/api.py:691
 msgid "cannot add this property: \"{0}\""
 msgstr "ne peut pas ajouter cette propriété : \"{0}\""
 
-#: tiramisu/api.py:634
+#: tiramisu/api.py:718
 msgid ""
 "cannot remove option's property \"{0}\", use permissive instead in option "
 "\"{1}\""
@@ -74,11 +74,11 @@ msgstr ""
 "ne supprimer la propriété \"{0}\" de l'option, utiliser plutôt permissive "
 "dans l'option \"{1}\""
 
-#: tiramisu/api.py:638
+#: tiramisu/api.py:722
 msgid "cannot find \"{0}\" in option \"{1}\""
 msgstr "ne peut trouver \"{0}\" dans l'option \"{1}\""
 
-#: tiramisu/api.py:643
+#: tiramisu/api.py:727
 msgid ""
 "cannot remove option's property \"{0}\", use permissive instead in option "
 "\"{1}\" at index \"{2}\""
@@ -86,35 +86,35 @@ msgstr ""
 "ne peut supprimer la propriété \"{0}\" de l'option, utilisez plutôt "
 "permissive dans l'option \"{1}\" a l'index \"{2}\""
 
-#: tiramisu/api.py:647
+#: tiramisu/api.py:731
 msgid "cannot find \"{0}\" in option \"{1}\" at index \"{2}\""
 msgstr "ne peut trouver \"{0}\" dans l'option \"{1}\" à l'index \"{2}\""
 
-#: tiramisu/api.py:691
+#: tiramisu/api.py:775
 msgid "cannot find \"{0}\""
 msgstr "ne peut trouver \"{0}\""
 
-#: tiramisu/api.py:873
+#: tiramisu/api.py:957
 msgid "only multi value has defaultmulti"
 msgstr "seule les valeurs multiple a l'attribut defaultmulti"
 
-#: tiramisu/api.py:1037
+#: tiramisu/api.py:1121
 msgid "please specify a valid sub function ({0}.{1}) for {2}"
 msgstr "veuillez spécifier une sous fonction valide ({0}.{1}) pour {2}"
 
-#: tiramisu/api.py:1424
+#: tiramisu/api.py:1520
 msgid "properties must be a frozenset"
 msgstr "une propriété doit être de type frozenset"
 
-#: tiramisu/api.py:1428 tiramisu/api.py:1455
+#: tiramisu/api.py:1524 tiramisu/api.py:1551
 msgid "unknown when {} (must be in append or remove)"
 msgstr "value {}  inconsistent (doit être append ou remove)"
 
-#: tiramisu/api.py:1441 tiramisu/api.py:1465 tiramisu/config.py:1676
+#: tiramisu/api.py:1537 tiramisu/api.py:1561 tiramisu/config.py:1691
 msgid "unknown type {}"
 msgstr "type inconnu {}"
 
-#: tiramisu/api.py:1829
+#: tiramisu/api.py:1927
 msgid "do not use unrestraint, nowarnings or forcepermissive together"
 msgstr ""
 "il ne faut pas utiliser unrestraint, nowarnings ou forcepermissive ensemble"
@@ -183,29 +183,29 @@ msgstr "le premier argument ({0}) doit être une fonction"
 msgid "help_function ({0}) must be a function"
 msgstr "help_function ({0}) doit être une fonction"
 
-#: tiramisu/autolib.py:469 tiramisu/autolib.py:524
+#: tiramisu/autolib.py:469 tiramisu/autolib.py:525
 msgid "the option {0} is used in a calculation but is invalid ({1})"
 msgstr "l'option {0} est utilisé dans un calcul mais est invalide ({1})"
 
-#: tiramisu/autolib.py:482 tiramisu/autolib.py:538 tiramisu/autolib.py:588
+#: tiramisu/autolib.py:482 tiramisu/autolib.py:539 tiramisu/autolib.py:589
 msgid "unable to get value for calculating {0}, {1}"
 msgstr "impossible de trouver la valeur pour calculer {0}, {1}"
 
-#: tiramisu/autolib.py:517
+#: tiramisu/autolib.py:518
 msgid "unable to carry out a calculation for {0}, {1}"
 msgstr "impossible d'effectuer le calcul pour {0}, {1}"
 
-#: tiramisu/autolib.py:563
+#: tiramisu/autolib.py:564
 msgid "cannot find information for {0}, {1} is a dynamic option"
 msgstr "ne peut trouver l'information pour {0}, {1} est une option dynamique"
 
-#: tiramisu/autolib.py:603
+#: tiramisu/autolib.py:604
 msgid "option {0} is not a dynoptiondescription or in a dynoptiondescription"
 msgstr ""
 "l'option {0} n'est pas une dynoptiondescription ou n'est pas dans une "
 "dynoptiondescription"
 
-#: tiramisu/autolib.py:696
+#: tiramisu/autolib.py:697
 msgid ""
 "cannot calculate arguments for {0}, {1} with identifier \"{2}\", there is no "
 "identifiers"
@@ -213,7 +213,7 @@ msgstr ""
 "impossible de calculer les arguments de {0}, {1} avec l'identifiant \"{2}\", "
 "il n'y a pas d'identifiants"
 
-#: tiramisu/autolib.py:708
+#: tiramisu/autolib.py:709
 msgid ""
 "cannot calculate arguments for {0}, {1} with identifier \"{2}\", list of "
 "valid identifiers: {3}"
@@ -221,12 +221,12 @@ msgstr ""
 "impossible de calculer les arguments de {0}, {1} avec l'identifiant \"{2}\", "
 "voici la liste des identifiants valables : {3}"
 
-#: tiramisu/autolib.py:819
+#: tiramisu/autolib.py:820
 msgid "the follower {0} must have index in carry_out_calculation!"
 msgstr ""
 "la variable suiveuse {0} doit avoir un index dans carry_out_calculation!"
 
-#: tiramisu/autolib.py:931
+#: tiramisu/autolib.py:932
 msgid ""
 "unexpected error \"{1}\" in function \"{2}\" with arguments \"{3}\" and "
 "\"{4}\" for option {0}"
@@ -234,50 +234,54 @@ msgstr ""
 "erreur inattendue \"{1}\" dans la fonction \"{2}\" avec les arguments "
 "\"{3}\" et \"{4}\" pour l'option {0}"
 
-#: tiramisu/autolib.py:941
+#: tiramisu/autolib.py:942
 msgid "unexpected error \"{1}\" in function \"{2}\" for option {0}"
 msgstr "erreur inattendue \"{1}\" dans la fonction \"{2}\" pour l'option {0}"
 
-#: tiramisu/config.py:574
+#: tiramisu/config.py:391 tiramisu/config.py:413
+msgid "option name {0} is not unique in {1}"
+msgstr "le nom de l'option {0} n'est pas unique dans {1}"
+
+#: tiramisu/config.py:638
 msgid "there is no option description for this config (may be GroupConfig)"
 msgstr ""
 "il n'y a pas d'option description trouvé pour cette config (peut être un "
 "GroupConfig)"
 
-#: tiramisu/config.py:663
-msgid "no option found in config with these criteria"
-msgstr "aucune option trouvée dans la config avec ces critères"
-
-#: tiramisu/config.py:978 tiramisu/option/optiondescription.py:74
+#: tiramisu/config.py:989 tiramisu/option/optiondescription.py:74
 msgid "option description seems to be part of an other config"
 msgstr "l'option description semble faire parti d'une autre config"
 
-#: tiramisu/config.py:1140
+#: tiramisu/config.py:1151
 msgid "parent of {0} not already exists"
 msgstr "le parent de {0} n'existe plus"
 
-#: tiramisu/config.py:1187
+#: tiramisu/config.py:1198
 msgid "cannot set leadership object has root optiondescription"
 msgstr "ne peut assigner un objet leadership comme optiondescription racine"
 
-#: tiramisu/config.py:1190
+#: tiramisu/config.py:1201
 msgid "cannot set dynoptiondescription object has root optiondescription"
 msgstr ""
 "ne peut assigner un objet dynoptiondescription comme optiondescription racine"
 
-#: tiramisu/config.py:1242
+#: tiramisu/config.py:1248
+msgid "child must be a Config, GroupConfig, MixConfig or MetaConfig"
+msgstr "l'enfant doit être une Config, GroupConfig, MixConfig ou MetaConfig"
+
+#: tiramisu/config.py:1257
 msgid "config name must be uniq in groupconfig for \"{0}\""
 msgstr "le nom d'un config doit être unique dans un groupconfig pour \"{0}\""
 
-#: tiramisu/config.py:1453
+#: tiramisu/config.py:1466
 msgid "unknown config \"{}\""
 msgstr "config \"{}\" inconnue"
 
-#: tiramisu/config.py:1478
+#: tiramisu/config.py:1491
 msgid "child must be a Config, MixConfig or MetaConfig"
 msgstr "l'enfant doit être une Config, MixConfig ou MetaConfig"
 
-#: tiramisu/config.py:1513
+#: tiramisu/config.py:1526
 msgid ""
 "force_default, force_default_if_same or force_dont_change_value cannot be "
 "set with only_config"
@@ -285,43 +289,43 @@ msgstr ""
 "force_default, force_default_if_same ou force_dont_change_value ne peuvent "
 "pas être spécifié avec only_config"
 
-#: tiramisu/config.py:1523
+#: tiramisu/config.py:1536
 msgid "force_default and force_dont_change_value cannot be set together"
 msgstr ""
 "force_default et force_dont_change_value ne peuvent pas être mis ensemble"
 
-#: tiramisu/config.py:1672
+#: tiramisu/config.py:1687
 msgid "config name must be uniq in groupconfig for {0}"
 msgstr "le nom de la config doit être unique dans un groupconfig pour {0}"
 
-#: tiramisu/config.py:1717
+#: tiramisu/config.py:1732
 msgid "config added has no name, the name is mandatory"
 msgstr "la config ajoutée n'a pas de nom, le nom est obligatoire"
 
-#: tiramisu/config.py:1722
+#: tiramisu/config.py:1737
 msgid "config name \"{0}\" is not uniq in groupconfig \"{1}\""
 msgstr ""
 "le nom d'un config \"{0}\" n'est pas unique dans le groupconfig \"{1}\""
 
-#: tiramisu/config.py:1740 tiramisu/config.py:1746
+#: tiramisu/config.py:1755 tiramisu/config.py:1761
 msgid "cannot find the config {0}"
 msgstr "ne peut pas trouver la config {0}"
 
-#: tiramisu/config.py:1772
+#: tiramisu/config.py:1787
 msgid "MetaConfig with optiondescription must have string has child, not {}"
 msgstr ""
 "MetaConfig avec une optiondescription doit avoir un nom comme enfant, pas {}"
 
-#: tiramisu/config.py:1784
+#: tiramisu/config.py:1799
 msgid "child must be a Config or MetaConfig"
 msgstr "enfant doit être une une Config ou une MetaConfig"
 
-#: tiramisu/config.py:1789
+#: tiramisu/config.py:1804
 msgid "all config in metaconfig must have the same optiondescription"
 msgstr ""
 "toutes les configs d'une metaconfig doivent avoir la même optiondescription"
 
-#: tiramisu/config.py:1806
+#: tiramisu/config.py:1821
 msgid "metaconfig must have the same optiondescription"
 msgstr "metaconfig doivent avoir la même optiondescription"
 
@@ -354,8 +358,6 @@ msgid "cannot modify the {0} {1} because is frozen"
 msgstr "ne peut modifier {0} {1} parce qu'est frozen"
 
 #: tiramisu/error.py:160
-#, fuzzy
-#| msgid "cannot access to {0} {1} at index \"{2}\" because {2} hasn't value"
 msgid "cannot access to {0} {1} at index \"{2}\" because {3} hasn't value"
 msgstr ""
 "ne peut accéder à {0} {1} à l'index \"{2}\" parce que {3} n'a pas de valeur"
@@ -455,24 +457,24 @@ msgstr ""
 "la fonction \"{0}\" ne doit pas retourner une liste (\"{1}\") pour l'option "
 "suiveuse {2}"
 
-#: tiramisu/error.py:331
+#: tiramisu/error.py:333
 msgid "invalid value"
 msgstr "valeur invalide"
 
-#: tiramisu/error.py:341
+#: tiramisu/error.py:343
 msgid "attention, \"{0}\" could be an invalid {1} for {2}"
 msgstr "attention, \"{0}\" peut être un {1} invalide pour {2}"
 
-#: tiramisu/error.py:345
+#: tiramisu/error.py:347
 msgid "attention, \"{0}\" could be an invalid {1} for {2} at index \"{3}\""
 msgstr ""
 "attention, \"{0}\" peut être un {1} invalide pour {2} à l'index \"{3}\""
 
-#: tiramisu/error.py:366 tiramisu/error.py:377
+#: tiramisu/error.py:368 tiramisu/error.py:379
 msgid "\"{0}\" is an invalid {1} for {2}"
 msgstr "\"{0}\" est une valeur invalide pour l'option {2} de type {1}"
 
-#: tiramisu/error.py:368
+#: tiramisu/error.py:370
 msgid "\"{0}\" is an invalid {1} for {2} at index \"{3}\""
 msgstr "\"{0}\" est un {1} invalide pour {2} à l'index \"{3}\""
 
@@ -547,33 +549,33 @@ msgstr "la valeur de \"{0}\" est {1}"
 msgid "the value of \"{0}\" is not {1}"
 msgstr "la valeur de \"{0}\" n'est pas {1}"
 
-#: tiramisu/option/baseoption.py:75 tiramisu/option/symlinkoption.py:44
+#: tiramisu/option/baseoption.py:76 tiramisu/option/symlinkoption.py:44
 msgid "\"{0}\" is an invalid name for an option"
 msgstr "\"{0}\" est un nom invalide pour une option"
 
-#: tiramisu/option/baseoption.py:88
+#: tiramisu/option/baseoption.py:89
 msgid "invalid properties type {0} for {1}, must be a frozenset"
 msgstr "type {0} invalide pour des propriétés pour {1}, doit être un frozenset"
 
-#: tiramisu/option/baseoption.py:100
+#: tiramisu/option/baseoption.py:102
 msgid "invalid property type {0} for {1}, must be a string or a Calculation"
 msgstr ""
 "type {0} invalide pour des propriétés pour {1}, doit être des caractères ou "
 "un objet Calculation"
 
-#: tiramisu/option/baseoption.py:251
+#: tiramisu/option/baseoption.py:253
 msgid "information's item for {0} not found: \"{1}\""
 msgstr "item pour {0} dans les informations non trouvée: \"{1}\""
 
-#: tiramisu/option/baseoption.py:269
+#: tiramisu/option/baseoption.py:271
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seule"
 
-#: tiramisu/option/baseoption.py:310
+#: tiramisu/option/baseoption.py:312
 msgid "\"{}\" ({}) object attribute \"{}\" is read-only"
 msgstr "\"{}\" ({}) l'attribut de l'objet \"{}\" est en lecture seule"
 
-#: tiramisu/option/baseoption.py:322
+#: tiramisu/option/baseoption.py:324
 msgid "{0} not part of any Config"
 msgstr "{0} ne fait pas parti d'une Config"
 
@@ -581,19 +583,19 @@ msgstr "{0} ne fait pas parti d'une Config"
 msgid "invalid string"
 msgstr "invalide caractère"
 
-#: tiramisu/option/choiceoption.py:47
+#: tiramisu/option/choiceoption.py:52
 msgid "values must be a tuple or a calculation for {0}"
 msgstr "les valeurs doivent être un tuple ou une fonction pour {0}"
 
-#: tiramisu/option/choiceoption.py:70
+#: tiramisu/option/choiceoption.py:75
 msgid "the calculated values \"{0}\" for \"{1}\" is not a list"
 msgstr "les valeurs calculées \"{0}\" pour \"{1}\" n'est pas une liste"
 
-#: tiramisu/option/choiceoption.py:101
+#: tiramisu/option/choiceoption.py:106
 msgid "only \"{0}\" is allowed"
 msgstr "seul \"{0}\" est autorisé"
 
-#: tiramisu/option/choiceoption.py:103
+#: tiramisu/option/choiceoption.py:108
 msgid "only {0} are allowed"
 msgstr "seul {0} sont autorisées"
 
@@ -696,7 +698,7 @@ msgstr ""
 msgid "invalid identifier \"{}\" for option {}"
 msgstr "identifiant \"{}\" invalide pour l'option \"{}\""
 
-#: tiramisu/option/dynoptiondescription.py:150
+#: tiramisu/option/dynoptiondescription.py:154
 msgid ""
 "DynOptionDescription \"{0}\" identifiers return a list with same values "
 "\"{1}\""
@@ -849,42 +851,45 @@ msgstr ""
 msgid "the value \"{}\" is not unique"
 msgstr "la valeur \"{}\" n'est pas unique"
 
-#: tiramisu/option/option.py:356
+#: tiramisu/option/option.py:357
 msgid "which must not be a list"
 msgstr "qui ne doit pas être une liste"
 
-#: tiramisu/option/option.py:408 tiramisu/option/option.py:434
+#: tiramisu/option/option.py:412 tiramisu/option/option.py:450
 msgid "which must be a list"
 msgstr "qui doit être une liste"
 
-#: tiramisu/option/option.py:428
+#: tiramisu/option/option.py:440
 msgid "which \"{}\" must be a list of list"
 msgstr "lequel \"{}\" doit être une liste de liste"
 
-#: tiramisu/option/optiondescription.py:109
-msgid "duplicate option: {0}"
-msgstr "option dupliquée : {0}"
+#: tiramisu/option/optiondescription.py:111
+#: tiramisu/option/optiondescription.py:117
+msgid "\"{0}\" option description"
+msgstr "l'option description \"{0}\""
 
-#: tiramisu/option/optiondescription.py:336
+#: tiramisu/option/optiondescription.py:115
+#: tiramisu/option/optiondescription.py:121
+msgid "root option description"
+msgstr "l'option description racine"
+
+#: tiramisu/option/optiondescription.py:123
+msgid "option \"{0}\" is include in {1} but is also in {2}"
+msgstr "l'option \"{0}\" est incluse dans {1} mais est aussi dans {2}"
+
+#: tiramisu/option/optiondescription.py:328
 msgid "children in optiondescription \"{}\" must be a list"
 msgstr "les enfants d'une optiondescription \"{}\" doivent être une liste"
 
-#: tiramisu/option/optiondescription.py:364
-msgid "duplicate option name: \"{0}\""
-msgstr "nom de l'option dupliqué : \"{0}\""
+#: tiramisu/option/optiondescription.py:357
+msgid "the option name \"{0}\" is duplicate in \"{1}\""
+msgstr "le nom de l'option \"{0}\" est dupliqué dans \"{1}\""
 
-#: tiramisu/option/optiondescription.py:370
-msgid ""
-"the option's name \"{0}\" start as the dynoptiondescription's name \"{1}\""
-msgstr ""
-"le nom de l'option \"{0}\" commence comme le nom du dynoptiondescription "
-"\"{1}\""
-
-#: tiramisu/option/optiondescription.py:413
+#: tiramisu/option/optiondescription.py:411
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr "ne peut changer group_type si déjà spécifié (ancien {0}, nouveau {1})"
 
-#: tiramisu/option/optiondescription.py:418
+#: tiramisu/option/optiondescription.py:416
 msgid "group_type: {0} not allowed"
 msgstr "group_type : {0} non autorisé"
 
@@ -925,27 +930,27 @@ msgstr "{0} a plus de droit que {1}"
 msgid "too weak"
 msgstr "trop simple"
 
-#: tiramisu/option/portoption.py:80
+#: tiramisu/option/portoption.py:77
 msgid "inconsistency in allowed range"
 msgstr "inconsistence dans la plage autorisée"
 
-#: tiramisu/option/portoption.py:85
+#: tiramisu/option/portoption.py:82
 msgid "max value is empty"
 msgstr "la valeur maximum est vide"
 
-#: tiramisu/option/portoption.py:98
+#: tiramisu/option/portoption.py:95
 msgid "range must have two values only"
 msgstr "un rang doit avoir deux valeurs seulement"
 
-#: tiramisu/option/portoption.py:101
+#: tiramisu/option/portoption.py:98
 msgid "first port in range must be smaller than the second one"
 msgstr "le premier port d'un rang doit être plus petit que le second"
 
-#: tiramisu/option/portoption.py:127
+#: tiramisu/option/portoption.py:124
 msgid "should be between {0} and {1}"
 msgstr "devrait être une nombre entre {0} et {1}"
 
-#: tiramisu/option/portoption.py:129
+#: tiramisu/option/portoption.py:126
 msgid "must be between {0} and {1}"
 msgstr "doit être une nombre entre {0} et {1}"
 
@@ -989,8 +994,8 @@ msgid ""
 "invalid property type {type(new_prop)} for {subconfig.option.impl_getname()} "
 "with {prop.function.__name__} function"
 msgstr ""
-"type {type(new_prop)} de la propriété invalide pour la fonction {subconfig."
-"option.impl_getname()} with {prop.function.__name__}"
+"type {type(new_prop)} de la propriété invalide pour la fonction "
+"{subconfig.option.impl_getname()} with {prop.function.__name__}"
 
 #: tiramisu/setting.py:606
 msgid "permissive must be a frozenset"
@@ -1034,28 +1039,42 @@ msgstr ""
 msgid "unknown action {}"
 msgstr "action inconnue {}"
 
-#: tiramisu/value.py:570 tiramisu/value.py:872
+#: tiramisu/value.py:557 tiramisu/value.py:859
 msgid "set owner \"{0}\" is forbidden"
 msgstr "assigner l'utilisateur \"{0}\" est interdit"
 
-#: tiramisu/value.py:577
+#: tiramisu/value.py:564
 msgid "\"{0}\" is a default value, so we cannot change owner to \"{1}\""
 msgstr ""
 "\"{0}\" est une valeur par défaut, donc ne peut changer d'utilisateur à "
 "\"{1}\""
 
-#: tiramisu/value.py:751
-msgid ""
-"index {index} is greater than the length {length} for option {subconfig."
-"option.impl_get_display_name(with_quote=True)}"
-msgstr ""
-"l'index {index} est supérieur à la longueur \"{length}\" pour l'option "
-"\"{subconfig.option.impl_get_display_name(with_quote=True)}\""
-
-#: tiramisu/value.py:858
+#: tiramisu/value.py:845
 msgid "information's item not found \"{}\""
 msgstr "l'information de l'objet ne sont pas trouvé \"{}\""
 
+#~ msgid "no option found in config with these criteria"
+#~ msgstr "aucune option trouvée dans la config avec ces critères"
+
+#~ msgid ""
+#~ "the option's name \"{0}\" start as the dynoptiondescription's name \"{1}\""
+#~ msgstr ""
+#~ "le nom de l'option \"{0}\" commence comme le nom du dynoptiondescription "
+#~ "\"{1}\""
+
+#~ msgid "duplicate option name: \"{0}\""
+#~ msgstr "nom de l'option dupliqué : \"{0}\""
+
+#~ msgid "duplicate option: {0}"
+#~ msgstr "option dupliquée : {0}"
+
+#~ msgid ""
+#~ "index {index} is greater than the length {length} for option "
+#~ "{subconfig.option.impl_get_display_name(with_quote=True)}"
+#~ msgstr ""
+#~ "l'index {index} est supérieur à la longueur \"{length}\" pour l'option "
+#~ "\"{subconfig.option.impl_get_display_name(with_quote=True)}\""
+
 #~ msgid "cannot find \"{0}\" in \"{1}\""
 #~ msgstr "ne peut pas trouver \"{0}\" dans \"{1}\""
 
@@ -1077,9 +1096,6 @@ msgstr "l'information de l'objet ne sont pas trouvé \"{}\""
 #~ msgid "unknown option \"{0}\" in root optiondescription"
 #~ msgstr "option \"{0}\" inconnue dans l'optiondescription racine"
 
-#~ msgid "unknown option \"{0}\" in optiondescription {1}"
-#~ msgstr "option \"{0}\" inconnue dans l'optiondescription {1}"
-
 #~ msgid ""
 #~ "IP \"{ip[\"value\"]}\" ({ip[\"name\"]}) with this netmask is in fact a "
 #~ "broacast address"
@@ -1090,9 +1106,6 @@ msgstr "l'information de l'objet ne sont pas trouvé \"{}\""
 #~ msgid "Call: {}"
 #~ msgstr "Appel : {}"
 
-#~ msgid "option must not be an optiondescription"
-#~ msgstr "option ne doit pas être une optiondescription"
-
 #~ msgid "index must be set with the follower option \"{}\""
 #~ msgstr "l'index est obligatoire pour l'option suiveuse \"{}\""
 
@@ -1114,9 +1127,6 @@ msgstr "l'information de l'objet ne sont pas trouvé \"{}\""
 #~ msgid "cannot set session_id and config together"
 #~ msgstr "session_id et config ne peut être mis ensemble"
 
-#~ msgid "\"{0}\" must be an optiondescription, not an {1}"
-#~ msgstr "\"{0}\" doit être une optiondescription, et non {1}"
-
 #~ msgid "unknown option {}"
 #~ msgstr "option {} inconnue"
 
diff --git a/locale/tiramisu.pot b/locale/tiramisu.pot
index b9b4dc1..1fef334 100644
--- a/locale/tiramisu.pot
+++ b/locale/tiramisu.pot
@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2025-06-28 10:15+0300\n"
+"POT-Creation-Date: 2025-09-19 22:05+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -35,7 +35,7 @@ msgstr ""
 msgid "Commands:"
 msgstr ""
 
-#: tiramisu/api.py:118 tiramisu/api.py:1920
+#: tiramisu/api.py:118 tiramisu/api.py:1955
 msgid "please specify a valid sub function ({0}.{1})"
 msgstr ""
 
@@ -43,67 +43,67 @@ msgstr ""
 msgid "please do not specify index ({0}.{1})"
 msgstr ""
 
-#: tiramisu/api.py:211 tiramisu/api.py:906
+#: tiramisu/api.py:211 tiramisu/api.py:940
 msgid "please specify index with a follower option ({0}.{1})"
 msgstr ""
 
-#: tiramisu/api.py:232
+#: tiramisu/api.py:234
 msgid "please specify a valid sub function ({0}.{1}): {2}"
 msgstr ""
 
-#: tiramisu/api.py:493
+#: tiramisu/api.py:525
 msgid "the option {0} is not a dynamic option, cannot get identifiers with only_self parameter to True"
 msgstr ""
 
-#: tiramisu/api.py:581
+#: tiramisu/api.py:613
 msgid "cannot get option from a follower symlink without index"
 msgstr ""
 
-#: tiramisu/api.py:657
+#: tiramisu/api.py:691
 msgid "cannot add this property: \"{0}\""
 msgstr ""
 
-#: tiramisu/api.py:684
+#: tiramisu/api.py:718
 msgid "cannot remove option's property \"{0}\", use permissive instead in option \"{1}\""
 msgstr ""
 
-#: tiramisu/api.py:688
+#: tiramisu/api.py:722
 msgid "cannot find \"{0}\" in option \"{1}\""
 msgstr ""
 
-#: tiramisu/api.py:693
+#: tiramisu/api.py:727
 msgid "cannot remove option's property \"{0}\", use permissive instead in option \"{1}\" at index \"{2}\""
 msgstr ""
 
-#: tiramisu/api.py:697
+#: tiramisu/api.py:731
 msgid "cannot find \"{0}\" in option \"{1}\" at index \"{2}\""
 msgstr ""
 
-#: tiramisu/api.py:741
+#: tiramisu/api.py:775
 msgid "cannot find \"{0}\""
 msgstr ""
 
-#: tiramisu/api.py:923
+#: tiramisu/api.py:957
 msgid "only multi value has defaultmulti"
 msgstr ""
 
-#: tiramisu/api.py:1087
+#: tiramisu/api.py:1121
 msgid "please specify a valid sub function ({0}.{1}) for {2}"
 msgstr ""
 
-#: tiramisu/api.py:1485
+#: tiramisu/api.py:1520
 msgid "properties must be a frozenset"
 msgstr ""
 
-#: tiramisu/api.py:1489 tiramisu/api.py:1516
+#: tiramisu/api.py:1524 tiramisu/api.py:1551
 msgid "unknown when {} (must be in append or remove)"
 msgstr ""
 
-#: tiramisu/api.py:1502 tiramisu/api.py:1526 tiramisu/config.py:1722
+#: tiramisu/api.py:1537 tiramisu/api.py:1561 tiramisu/config.py:1691
 msgid "unknown type {}"
 msgstr ""
 
-#: tiramisu/api.py:1892
+#: tiramisu/api.py:1927
 msgid "do not use unrestraint, nowarnings or forcepermissive together"
 msgstr ""
 
@@ -167,123 +167,123 @@ msgstr ""
 msgid "help_function ({0}) must be a function"
 msgstr ""
 
-#: tiramisu/autolib.py:469 tiramisu/autolib.py:524
+#: tiramisu/autolib.py:469 tiramisu/autolib.py:525
 msgid "the option {0} is used in a calculation but is invalid ({1})"
 msgstr ""
 
-#: tiramisu/autolib.py:482 tiramisu/autolib.py:538 tiramisu/autolib.py:588
+#: tiramisu/autolib.py:482 tiramisu/autolib.py:539 tiramisu/autolib.py:589
 msgid "unable to get value for calculating {0}, {1}"
 msgstr ""
 
-#: tiramisu/autolib.py:517
+#: tiramisu/autolib.py:518
 msgid "unable to carry out a calculation for {0}, {1}"
 msgstr ""
 
-#: tiramisu/autolib.py:563
+#: tiramisu/autolib.py:564
 msgid "cannot find information for {0}, {1} is a dynamic option"
 msgstr ""
 
-#: tiramisu/autolib.py:603
+#: tiramisu/autolib.py:604
 msgid "option {0} is not a dynoptiondescription or in a dynoptiondescription"
 msgstr ""
 
-#: tiramisu/autolib.py:696
+#: tiramisu/autolib.py:697
 msgid "cannot calculate arguments for {0}, {1} with identifier \"{2}\", there is no identifiers"
 msgstr ""
 
-#: tiramisu/autolib.py:708
+#: tiramisu/autolib.py:709
 msgid "cannot calculate arguments for {0}, {1} with identifier \"{2}\", list of valid identifiers: {3}"
 msgstr ""
 
-#: tiramisu/autolib.py:819
+#: tiramisu/autolib.py:820
 msgid "the follower {0} must have index in carry_out_calculation!"
 msgstr ""
 
-#: tiramisu/autolib.py:931
+#: tiramisu/autolib.py:932
 msgid "unexpected error \"{1}\" in function \"{2}\" with arguments \"{3}\" and \"{4}\" for option {0}"
 msgstr ""
 
-#: tiramisu/autolib.py:941
+#: tiramisu/autolib.py:942
 msgid "unexpected error \"{1}\" in function \"{2}\" for option {0}"
 msgstr ""
 
-#: tiramisu/config.py:609
+#: tiramisu/config.py:391 tiramisu/config.py:413
+msgid "option name {0} is not unique in {1}"
+msgstr ""
+
+#: tiramisu/config.py:638
 msgid "there is no option description for this config (may be GroupConfig)"
 msgstr ""
 
-#: tiramisu/config.py:698
-msgid "no option found in config with these criteria"
-msgstr ""
-
-#: tiramisu/config.py:1024 tiramisu/option/optiondescription.py:74
+#: tiramisu/config.py:989 tiramisu/option/optiondescription.py:74
 msgid "option description seems to be part of an other config"
 msgstr ""
 
-#: tiramisu/config.py:1186
+#: tiramisu/config.py:1151
 msgid "parent of {0} not already exists"
 msgstr ""
 
-#: tiramisu/config.py:1233
+#: tiramisu/config.py:1198
 msgid "cannot set leadership object has root optiondescription"
 msgstr ""
 
-#: tiramisu/config.py:1236
+#: tiramisu/config.py:1201
 msgid "cannot set dynoptiondescription object has root optiondescription"
 msgstr ""
 
-#: tiramisu/config.py:1282
+#: tiramisu/config.py:1248
 msgid "child must be a Config, GroupConfig, MixConfig or MetaConfig"
 msgstr ""
 
-#: tiramisu/config.py:1290
+#: tiramisu/config.py:1257
 msgid "config name must be uniq in groupconfig for \"{0}\""
 msgstr ""
 
-#: tiramisu/config.py:1499
+#: tiramisu/config.py:1466
 msgid "unknown config \"{}\""
 msgstr ""
 
-#: tiramisu/config.py:1524
+#: tiramisu/config.py:1491
 msgid "child must be a Config, MixConfig or MetaConfig"
 msgstr ""
 
-#: tiramisu/config.py:1559
+#: tiramisu/config.py:1526
 msgid "force_default, force_default_if_same or force_dont_change_value cannot be set with only_config"
 msgstr ""
 
-#: tiramisu/config.py:1569
+#: tiramisu/config.py:1536
 msgid "force_default and force_dont_change_value cannot be set together"
 msgstr ""
 
-#: tiramisu/config.py:1718
+#: tiramisu/config.py:1687
 msgid "config name must be uniq in groupconfig for {0}"
 msgstr ""
 
-#: tiramisu/config.py:1763
+#: tiramisu/config.py:1732
 msgid "config added has no name, the name is mandatory"
 msgstr ""
 
-#: tiramisu/config.py:1768
+#: tiramisu/config.py:1737
 msgid "config name \"{0}\" is not uniq in groupconfig \"{1}\""
 msgstr ""
 
-#: tiramisu/config.py:1786 tiramisu/config.py:1792
+#: tiramisu/config.py:1755 tiramisu/config.py:1761
 msgid "cannot find the config {0}"
 msgstr ""
 
-#: tiramisu/config.py:1818
+#: tiramisu/config.py:1787
 msgid "MetaConfig with optiondescription must have string has child, not {}"
 msgstr ""
 
-#: tiramisu/config.py:1830
+#: tiramisu/config.py:1799
 msgid "child must be a Config or MetaConfig"
 msgstr ""
 
-#: tiramisu/config.py:1835
+#: tiramisu/config.py:1804
 msgid "all config in metaconfig must have the same optiondescription"
 msgstr ""
 
-#: tiramisu/config.py:1852
+#: tiramisu/config.py:1821
 msgid "metaconfig must have the same optiondescription"
 msgstr ""
 
@@ -471,31 +471,31 @@ msgstr ""
 msgid "the value of \"{0}\" is not {1}"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:75 tiramisu/option/symlinkoption.py:44
+#: tiramisu/option/baseoption.py:76 tiramisu/option/symlinkoption.py:44
 msgid "\"{0}\" is an invalid name for an option"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:88
+#: tiramisu/option/baseoption.py:89
 msgid "invalid properties type {0} for {1}, must be a frozenset"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:100
+#: tiramisu/option/baseoption.py:102
 msgid "invalid property type {0} for {1}, must be a string or a Calculation"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:251
+#: tiramisu/option/baseoption.py:253
 msgid "information's item for {0} not found: \"{1}\""
 msgstr ""
 
-#: tiramisu/option/baseoption.py:269
+#: tiramisu/option/baseoption.py:271
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:310
+#: tiramisu/option/baseoption.py:312
 msgid "\"{}\" ({}) object attribute \"{}\" is read-only"
 msgstr ""
 
-#: tiramisu/option/baseoption.py:322
+#: tiramisu/option/baseoption.py:324
 msgid "{0} not part of any Config"
 msgstr ""
 
@@ -600,7 +600,7 @@ msgstr ""
 msgid "invalid identifier \"{}\" for option {}"
 msgstr ""
 
-#: tiramisu/option/dynoptiondescription.py:150
+#: tiramisu/option/dynoptiondescription.py:154
 msgid "DynOptionDescription \"{0}\" identifiers return a list with same values \"{1}\""
 msgstr ""
 
@@ -732,43 +732,49 @@ msgstr ""
 msgid "invalid default_multi value \"{0}\" for option {1}, must be a list for a submulti"
 msgstr ""
 
-#: tiramisu/option/option.py:291
+#: tiramisu/option/option.py:294
 msgid "the value \"{}\" is not unique"
 msgstr ""
 
-#: tiramisu/option/option.py:353
+#: tiramisu/option/option.py:357
 msgid "which must not be a list"
 msgstr ""
 
-#: tiramisu/option/option.py:408 tiramisu/option/option.py:446
+#: tiramisu/option/option.py:412 tiramisu/option/option.py:450
 msgid "which must be a list"
 msgstr ""
 
-#: tiramisu/option/option.py:436
+#: tiramisu/option/option.py:440
 msgid "which \"{}\" must be a list of list"
 msgstr ""
 
-#: tiramisu/option/optiondescription.py:109
-msgid "duplicate option: {0}"
+#: tiramisu/option/optiondescription.py:111
+#: tiramisu/option/optiondescription.py:117
+msgid "\"{0}\" option description"
 msgstr ""
 
-#: tiramisu/option/optiondescription.py:336
+#: tiramisu/option/optiondescription.py:115
+#: tiramisu/option/optiondescription.py:121
+msgid "root option description"
+msgstr ""
+
+#: tiramisu/option/optiondescription.py:123
+msgid "option \"{0}\" is include in {1} but is also in {2}"
+msgstr ""
+
+#: tiramisu/option/optiondescription.py:328
 msgid "children in optiondescription \"{}\" must be a list"
 msgstr ""
 
-#: tiramisu/option/optiondescription.py:364
-msgid "duplicate option name: \"{0}\""
+#: tiramisu/option/optiondescription.py:357
+msgid "the option name \"{0}\" is duplicate in \"{1}\""
 msgstr ""
 
-#: tiramisu/option/optiondescription.py:370
-msgid "the option's name \"{0}\" start as the dynoptiondescription's name \"{1}\""
-msgstr ""
-
-#: tiramisu/option/optiondescription.py:413
+#: tiramisu/option/optiondescription.py:411
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr ""
 
-#: tiramisu/option/optiondescription.py:418
+#: tiramisu/option/optiondescription.py:416
 msgid "group_type: {0} not allowed"
 msgstr ""
 
diff --git a/tests/test_config.py b/tests/test_config.py
index 56f1ee5..361b9bd 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -332,7 +332,7 @@ def test_duplicated_option():
     g1
     #in same OptionDescription
     with pytest.raises(ConflictError):
-        d1 = OptionDescription('od', '', [g1, g1])
+        OptionDescription('od', '', [g1, g1])
 #    assert not list_sessions()
 
 
@@ -346,6 +346,28 @@ def test_duplicated_option_diff_od():
         Config(d2)
 
 
+def test_duplicated_option_diff_od_2():
+    g1 = IntOption('g1', '', 1)
+    d1 = OptionDescription('od1', '', [g1])
+    #in different OptionDescription
+    d2 = OptionDescription('od2', '', [d1, g1])
+    d2
+    with pytest.raises(ConflictError):
+        Config(d2)
+
+
+def test_duplicated_option_diff_od_3():
+    g1 = IntOption('g1', '', 1)
+    d1 = OptionDescription('od1', '', [g1])
+    d3 = OptionDescription('od3', '', [g1])
+    #in different OptionDescription
+    d2 = OptionDescription('od2', '', [d1, d3])
+    d4 = OptionDescription('od4', '', [d2])
+    d4
+    with pytest.raises(ConflictError):
+        Config(d4)
+
+
 def test_cannot_assign_value_to_option_description():
     od1 = make_description()
     cfg = Config(od1)
diff --git a/tests/test_dyn_optiondescription.py b/tests/test_dyn_optiondescription.py
index bbb645e..8ac04fe 100644
--- a/tests/test_dyn_optiondescription.py
+++ b/tests/test_dyn_optiondescription.py
@@ -1720,16 +1720,6 @@ def test_leadership_callback_samegroup_dyndescription():
 #    assert not list_sessions()
 
 
-def test_invalid_conflict_dyndescription():
-    st = StrOption('st', '')
-    dod = DynOptionDescription('dod', '', [st], identifiers=Calculation(return_list))
-    dodinvalid = StrOption('dodinvalid', '')
-    dod, dodinvalid
-    with pytest.raises(ConflictError):
-        OptionDescription('od', '', [dod, dodinvalid])
-#    assert not list_sessions()
-
-
 def test_leadership_default_multi_dyndescription4():
     st1 = StrOption('st1', "", multi=True)
     st2 = StrOption('st2', "", multi=True, default_multi='no')
@@ -2883,3 +2873,86 @@ def test_callback_list_dyndescription_information_not_list():
     cfg.information.set('identifier', 'ival3')
     assert cfg.option('od.dodival3.st').value.get() == ['ival3', 'val2']
 #    assert not list_sessions()
+
+
+def test_dynoption_not_duplicate():
+    st = StrOption('st', '')
+    st2 = StrOption('st', '')
+    dod = DynOptionDescription('od_', '', [st], identifiers=["val1"])
+    dod2 = DynOptionDescription('od_', '', [st2], identifiers=["val2"])
+    od = OptionDescription('od', '', [dod, dod2])
+    od2 = OptionDescription('od', '', [od])
+    cfg = Config(od2)
+    assert parse_od_get(cfg.value.get()) == {
+       'od.od_val1.st': None,
+       'od.od_val2.st': None,
+    }
+
+
+def test_dynoption_duplicate_1():
+    st = StrOption('st', '', "val1")
+    od = OptionDescription('od_val', '', [st])
+    st2 = StrOption('st', '', "val2")
+    dod = DynOptionDescription('od_', '', [st2], identifiers=["val"])
+    od1 = OptionDescription('od', '', [od, dod])
+    od2 = OptionDescription('od', '', [od1])
+    cfg = Config(od2)
+    with pytest.raises(ConflictError):
+        cfg.value.get()
+    with pytest.raises(ConflictError):
+        cfg.option('od.od_val').value.get()
+
+
+def test_dynoption_duplicate_2():
+    st2 = StrOption('st', '', "val2")
+    dod = DynOptionDescription('od_', '', [st2], identifiers=["val"])
+    st = StrOption('st', '', "val1")
+    od = OptionDescription('od_val', '', [st])
+    od1 = OptionDescription('od', '', [dod, od])
+    od2 = OptionDescription('od', '', [od1])
+    cfg = Config(od2)
+    with pytest.raises(ConflictError):
+        cfg.value.get()
+    with pytest.raises(ConflictError):
+        cfg.option('od.od_val').value.get()
+
+
+def test_dynoption_duplicate_3():
+    st = StrOption('od_val', '')
+    st2 = StrOption('st', '', "val2")
+    dod = DynOptionDescription('od_', '', [st2], identifiers=["val"])
+    od1 = OptionDescription('od', '', [dod, st])
+    od2 = OptionDescription('od', '', [od1])
+    cfg = Config(od2)
+    with pytest.raises(ConflictError):
+        cfg.value.get()
+    with pytest.raises(ConflictError):
+        cfg.option('od.od_val').value.get()
+
+
+def test_dynoption_duplicate_4():
+    st = StrOption('st', '')
+    st2 = StrOption('st', '')
+    dod = DynOptionDescription('od_', '', [st], identifiers=["val"])
+    dod2 = DynOptionDescription('od_', '', [st2], identifiers=["val"])
+    od = OptionDescription('od', '', [dod, dod2])
+    od2 = OptionDescription('od', '', [od])
+    cfg = Config(od2)
+    with pytest.raises(ConflictError):
+        cfg.value.get()
+    with pytest.raises(ConflictError):
+        cfg.option('od.od_val').value.get()
+
+
+def test_dynoption_duplicate_5():
+    st = StrOption('st', '')
+    st2 = StrOption('st', '')
+    dod = DynOptionDescription('od_', '', [st], identifiers=["val"])
+    dod2 = DynOptionDescription('od', '', [st2], identifiers=["_val"])
+    od = OptionDescription('od', '', [dod, dod2])
+    od2 = OptionDescription('od', '', [od])
+    cfg = Config(od2)
+    with pytest.raises(ConflictError):
+        cfg.value.get()
+    with pytest.raises(ConflictError):
+        cfg.option('od.od_val').value.get()
diff --git a/tiramisu/api.py b/tiramisu/api.py
index a2274ab..2205b00 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -212,7 +212,9 @@ def option_type(typ):
                             "please specify index with a follower option ({0}.{1})"
                         ).format(self.__class__.__name__, func.__name__)
                         raise ConfigError(msg)
-                if 'validate_properties' in types or (self._validate_properties and "dont_validate_property" not in types):
+                if "validate_properties" in types or (
+                    self._validate_properties and "dont_validate_property" not in types
+                ):
                     settings = self._config_bag.context.get_settings()
                     parent = self._subconfig.parent
                     if parent and parent.transitive_properties:
@@ -267,7 +269,9 @@ class _TiramisuOptionWalk:
     ):
         options = []
         for sub_subconfig in subconfig.get_children(
-            validate_properties, uncalculated=uncalculated, with_index=with_index,
+            validate_properties,
+            uncalculated=uncalculated,
+            with_index=with_index,
         ):
             options.append(
                 TiramisuOption(
@@ -298,7 +302,15 @@ class _TiramisuOptionOptionDescription:
         """Get Tiramisu option"""
         return self._subconfig.option
 
-    @option_type(["optiondescription", "option", "with_or_without_index", "symlink", "allow_dynoption"])
+    @option_type(
+        [
+            "optiondescription",
+            "option",
+            "with_or_without_index",
+            "symlink",
+            "allow_dynoption",
+        ]
+    )
     def isoptiondescription(self):
         """Test if option is an optiondescription"""
         return self._subconfig.option.impl_is_optiondescription()
@@ -376,10 +388,14 @@ class _TiramisuOptionOptionDescription:
         index = self._index
         parent = self._subconfig.parent
         parent_option = parent.option
-        for woption in self._subconfig.option.get_dependencies(self._config_bag.context):
+        for woption in self._subconfig.option.get_dependencies(
+            self._config_bag.context
+        ):
             option = woption()
             if not uncalculated and option.issubdyn():
-                for subconfig in context.get_dynamic_from_dyn_option(self._subconfig, option):
+                for subconfig in context.get_dynamic_from_dyn_option(
+                    self._subconfig, option
+                ):
                     options.append(
                         TiramisuOption(
                             subconfig.path,
@@ -388,7 +404,9 @@ class _TiramisuOptionOptionDescription:
                         )
                     )
             elif not uncalculated and option.impl_is_dynoptiondescription():
-                for subconfig in context.get_dynamic_from_dyn_option(self._subconfig, option):
+                for subconfig in context.get_dynamic_from_dyn_option(
+                    self._subconfig, option
+                ):
                     options.append(
                         TiramisuOption(
                             subconfig.path,
@@ -397,7 +415,12 @@ class _TiramisuOptionOptionDescription:
                         )
                     )
             else:
-                if not option.impl_is_optiondescription() and option.impl_is_follower() and parent_option.impl_is_leadership() and parent_option.in_same_leadership(option):
+                if (
+                    not option.impl_is_optiondescription()
+                    and option.impl_is_follower()
+                    and parent_option.impl_is_leadership()
+                    and parent_option.in_same_leadership(option)
+                ):
                     if index is not None:
                         current_indexes = [index]
                     else:
@@ -606,7 +629,9 @@ class TiramisuOptionOwner(CommonTiramisuOption):
     @option_type(["symlink", "option", "with_index"])
     def get(self, only_self=False):
         """Get owner for a specified option"""
-        return self._config_bag.context.get_owner(self._subconfig, validate_meta=not only_self)
+        return self._config_bag.context.get_owner(
+            self._subconfig, validate_meta=not only_self
+        )
 
     @option_type(["symlink", "option", "with_index"])
     def isdefault(self):
@@ -1251,7 +1276,7 @@ class TiramisuContextValue(TiramisuConfig, _TiramisuODGet):
         path: str,
         value: Any,
         *,
-        index: Optional[int] = None, 
+        index: Optional[int] = None,
         only_config=undefined,
         force_default=undefined,
         force_default_if_same=undefined,
@@ -1269,12 +1294,13 @@ class TiramisuContextValue(TiramisuConfig, _TiramisuODGet):
             kwargs["force_dont_change_value"] = force_dont_change_value
         context = self._config_bag.context
         if isinstance(context, KernelGroupConfig):
-            subconfig = Fake_SubConfig(self._config_bag,
-                                       path,
-                                       index,
-                                       )
+            subconfig = Fake_SubConfig(
+                self._config_bag,
+                path,
+                index,
+            )
         else:
-            subconfig = context.get_sub_config( 
+            subconfig = context.get_sub_config(
                 self._config_bag,
                 path,
                 index,
diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index f31b5c5..82f279c 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -507,6 +507,7 @@ def manager_callback(
                 index_,
                 validate_properties=not self_calc,
                 properties=properties,
+                valid_conflict=False,
             )
         except PropertiesOptionError as err:
             # raise PropertiesOptionError (which is catched) because must not add value None in carry_out_calculation
diff --git a/tiramisu/config.py b/tiramisu/config.py
index a0a2313..d8fec1f 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -166,7 +166,7 @@ class CCache:
     def get_dynamic_from_dyn_option(self, subconfig, option):
         config_bag = subconfig.config_bag
         sub_paths = option.impl_getpath()
-        current_paths = subconfig.path.split('.')
+        current_paths = subconfig.path.split(".")
         current_paths_max_index = len(current_paths) - 1
         current_subconfigs = []
         parent = subconfig
@@ -186,7 +186,10 @@ class CCache:
                     allow_dynoption=True,
                 )
                 if sub_option.impl_is_dynoptiondescription():
-                    if idx <= current_paths_max_index and sub_option == current_subconfigs[idx].option:
+                    if (
+                        idx <= current_paths_max_index
+                        and sub_option == current_subconfigs[idx].option
+                    ):
                         new_currents.append(current_subconfigs[idx])
                     else:
                         new_currents.extend(
@@ -374,12 +377,26 @@ class SubConfig:
         if self.option.impl_is_leadership() and not uncalculated and with_index:
             yield from self.get_leadership_children(validate_properties)
         else:
+            children_name = []
             for child in self.option.get_children():
                 if child.impl_is_dynoptiondescription() and not uncalculated:
-                    yield from self.dyn_to_subconfig(
+                    for dyn_child in self.dyn_to_subconfig(
                         child,
                         validate_properties,
-                    )
+                    ):
+                        yield dyn_child
+                        if child.could_conflict:
+                            name = dyn_child.path
+                            if name in children_name:
+                                raise ConflictError(
+                                    _("option name \"{0}\" is not unique in {1}").format(
+                                        name,
+                                        self.option.impl_get_display_name(
+                                            self, with_quote=True
+                                        ),
+                                    )
+                                )
+                            children_name.append(name)
                 else:
                     try:
                         yield self.get_child(
@@ -390,6 +407,18 @@ class SubConfig:
                     except PropertiesOptionError as err:
                         if err.proptype in (["mandatory"], ["empty"]):
                             raise err
+                    if child.could_conflict:
+                        name = child.impl_getpath()
+                        if name in children_name:
+                            raise ConflictError(
+                                _("option name \"{0}\" is not unique in {1}").format(
+                                    name,
+                                    self.option.impl_get_display_name(
+                                        self, with_quote=True
+                                    ),
+                                )
+                            )
+                        children_name.append(name)
 
     def get_child(
         self,
@@ -561,15 +590,16 @@ class SubConfig:
     def change_context(self, context) -> "SubConfig":
         config_bag = self.config_bag.copy()
         config_bag.context = context
-        return SubConfig(self.option,
-                         self.index,
-                         self.path,
-                         config_bag,
-                         self.parent,
-                         self.identifiers,
-                         true_path=self.true_path,
-                         validate_properties=False,
-                         )
+        return SubConfig(
+            self.option,
+            self.index,
+            self.path,
+            config_bag,
+            self.parent,
+            self.identifiers,
+            true_path=self.true_path,
+            validate_properties=False,
+        )
 
 
 class _Config(CCache):
@@ -623,80 +653,8 @@ class _Config(CCache):
         """get cache for values"""
         return self._impl_values_cache  # pylint: disable=no-member
 
-    # =============================================================================
-    # WALK
-    def find(
-        self,
-        option_bag,
-        bytype,
-        byname,
-        byvalue,
-        raise_if_not_found=True,
-        only_path=undefined,
-        only_option=undefined,
-        with_option=False,
-    ):
-        """
-        convenience method for finding an option that lives only in the subtree
-
-        :param first: return only one option if True, a list otherwise
-        :return: find list or an exception if nothing has been found
-        """
-
-        # pylint: disable=too-many-arguments,too-many-locals
-        def _filter_by_value(soption_bag):
-            value = self.get_value(soption_bag)
-            if isinstance(value, list):
-                return byvalue in value
-            return value == byvalue
-
-        found = False
-        if only_path is not undefined:
-
-            def _fake_iter():
-                yield only_option
-
-            options = _fake_iter()
-        else:
-            options = option_bag.option.get_children_recursively(
-                bytype,
-                byname,
-                option_bag.config_bag,
-            )
-        for option in options:
-            path = option.impl_getpath()
-            soption_bag = OptionBag(
-                option,
-                None,
-                option_bag.config_bag,
-            )
-            if byvalue is not undefined and not _filter_by_value(soption_bag):
-                continue
-            if option_bag.config_bag.properties:
-                # remove option with propertyerror, ...
-                try:
-                    self.get_sub_config(
-                        option_bag.config_bag,  # pylint: disable=no-member
-                        path,
-                        None,
-                        validate_properties=True,
-                    )
-                except PropertiesOptionError:
-                    continue
-            found = True
-            if not with_option:
-                yield path
-            else:
-                yield path, option
-        self._find_return_results(
-            found,
-            raise_if_not_found,
-        )
-
-    def _find_return_results(self, found, raise_if_not_found):
-        if not found and raise_if_not_found:
-            raise AttributeError(_("no option found in config" " with these criteria"))
-
+    #    # =============================================================================
+    #    # WALK
     def walk_valid_value(
         self,
         subconfig,
@@ -741,6 +699,7 @@ class _Config(CCache):
         properties=undefined,
         true_path: Optional[str] = None,
         allow_dynoption: bool = False,
+        valid_conflict: bool = True,
     ):
         subconfig = self.get_root(config_bag)
         if path is None:
@@ -773,6 +732,32 @@ class _Config(CCache):
                 identifier, option = option
             else:
                 identifier = None
+            if valid_conflict and option.could_conflict:
+                for ref in option.could_conflict:
+                    child = ref()
+                    if child.impl_is_dynoptiondescription():
+                        for dyn_child in subconfig.dyn_to_subconfig(
+                            child,
+                            validate_properties,
+                        ):
+                            if path == dyn_child.path:
+                                raise ConflictError(
+                                    _("option name \"{0}\" is not unique in {1}").format(
+                                        name,
+                                        option.impl_get_display_name(
+                                            subconfig, with_quote=True
+                                        ),
+                                    )
+                                )
+                    elif child.impl_getname() == name:
+                        raise ConflictError(
+                            _("option name \"{0}\" is not unique in {1}").format(
+                                name,
+                                self.option.impl_get_display_name(
+                                    self, with_quote=True
+                                ),
+                            )
+                        )
             subconfig = subconfig.get_child(
                 option,
                 index_,
@@ -851,16 +836,14 @@ class _Config(CCache):
 
     # =============================================================================
     # Manage value
-    def set_value(self,    
-                  subconfig,
-                  value: Any,
-                  ) -> Any:
-        """set value
-        """
+    def set_value(
+        self,
+        subconfig,
+        value: Any,
+    ) -> Any:
+        """set value"""
         self.get_settings().validate_properties(subconfig)
-        return self.get_values().set_value(subconfig,
-                                           value
-                                           )
+        return self.get_values().set_value(subconfig, value)
 
     def get_value(
         self,
@@ -1282,7 +1265,9 @@ class KernelGroupConfig(_CommonConfig):
         names = []
         for child in children:
             if not isinstance(child, (KernelConfig, KernelGroupConfig)):
-                raise TypeError(_("child must be a Config, GroupConfig, MixConfig or MetaConfig"))
+                raise TypeError(
+                    _("child must be a Config, GroupConfig, MixConfig or MetaConfig")
+                )
             name_ = child._impl_name
             names.append(name_)
         if len(names) != len(set(names)):
@@ -1597,7 +1582,9 @@ class KernelMixConfig(KernelGroupConfig):
                             validate_properties=validate_properties,
                         )
                         if force_default_if_same:
-                            if not child.get_values().hasvalue(subconfig.path, index=subconfig.index):
+                            if not child.get_values().hasvalue(
+                                subconfig.path, index=subconfig.index
+                            ):
                                 child_value = undefined
                             else:
                                 child_value = child.get_value(moption_bag)
diff --git a/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo b/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo
index dae84d5..cb345cc 100644
Binary files a/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo and b/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo differ
diff --git a/tiramisu/option/baseoption.py b/tiramisu/option/baseoption.py
index cc82a95..2e12d7d 100644
--- a/tiramisu/option/baseoption.py
+++ b/tiramisu/option/baseoption.py
@@ -59,6 +59,7 @@ class Base:
         "_dependencies",
         "_dependencies_information",
         "_identifiers_dependencies",
+        "could_conflict",
         "__weakref__",
     )
 
@@ -93,6 +94,7 @@ class Base:
         _setattr = object.__setattr__
         _setattr(self, "_name", name)
         _setattr(self, "_informations", {"doc": doc})
+        _setattr(self, "could_conflict", [])
         for prop in properties:
             if not isinstance(prop, str):
                 if not isinstance(prop, Calculation):
@@ -188,6 +190,7 @@ class Base:
             else:
                 dico = tuple([keys, tuple(dico.values())])
             _setattr(self, "_informations", dico)
+            _setattr(self, "could_conflict", tuple(self.could_conflict))
             extra = getattr(self, "_extra", None)
             if extra is not None:
                 _setattr(
diff --git a/tiramisu/option/dynoptiondescription.py b/tiramisu/option/dynoptiondescription.py
index 734cd69..7ac13e2 100644
--- a/tiramisu/option/dynoptiondescription.py
+++ b/tiramisu/option/dynoptiondescription.py
@@ -82,6 +82,9 @@ class DynOptionDescription(OptionDescription):
             identifier = identifier.replace(".", "_")
         return identifier
 
+    def name_could_conflict(self, dynchild, child):
+        return child.impl_getname().startswith(dynchild.impl_getname())
+
     def impl_is_dynoptiondescription(self) -> bool:
         return True
 
@@ -145,7 +148,11 @@ class DynOptionDescription(OptionDescription):
                     )
             else:
                 values_.append(val)
-        if __debug__ and "demoting_error_warning" not in subconfig.config_bag.properties and len(values_) > len(set(values_)):
+        if (
+            __debug__
+            and "demoting_error_warning" not in subconfig.config_bag.properties
+            and len(values_) > len(set(values_))
+        ):
             raise ValueError(
                 _(
                     'DynOptionDescription "{0}" identifiers return a list with same values "{1}"'
diff --git a/tiramisu/option/option.py b/tiramisu/option/option.py
index 7c574d6..2149d0c 100644
--- a/tiramisu/option/option.py
+++ b/tiramisu/option/option.py
@@ -286,9 +286,13 @@ class Option(BaseOption):
                 return
             if not subconfig or not check_error or "unique" not in subconfig.properties:
                 return
-            indexes = [index for index, value in enumerate(values) if value == current_value]
+            indexes = [
+                index for index, value in enumerate(values) if value == current_value
+            ]
             if len(indexes) > 1:
-                raise ValueError(_('the value "{}" is not unique' "").format(current_value))
+                raise ValueError(
+                    _('the value "{}" is not unique' "").format(current_value)
+                )
 
         def calculation_validator(
             val,
@@ -456,7 +460,7 @@ class Option(BaseOption):
                 except ValueError as err:
                     self.validate_parse_error(val, err_index, err, subconfig)
                     ret = False
-#            return False
+        #            return False
         return ret
 
     def validate_parse_error(self, val, index, err, subconfig):
diff --git a/tiramisu/option/optiondescription.py b/tiramisu/option/optiondescription.py
index b67c5e2..9fdd0df 100644
--- a/tiramisu/option/optiondescription.py
+++ b/tiramisu/option/optiondescription.py
@@ -106,7 +106,24 @@ class CacheOptionDescription(BaseOption):
                 if "force_store_value" in properties:
                     force_store_values.append(option)
             if option.impl_is_readonly():
-                raise ConflictError(_("duplicate option: {0}").format(option))
+                previous_path = option.impl_getpath()
+                if "." in previous_path:
+                    previous_path = _('"{0}" option description').format(
+                        previous_path.rsplit(".", 1)[0]
+                    )
+                else:
+                    previous_path = _("root option description")
+                if currpath:
+                    current_path = _('"{0}" option description').format(
+                        ".".join(currpath)
+                    )
+                else:
+                    current_path = _("root option description")
+                raise ConflictError(
+                    _('option "{0}" is include in {1} but is also in {2}').format(
+                        option.impl_get_display_name(None), current_path, previous_path
+                    )
+                )
             if not self.impl_is_readonly() and display_name:
                 option._display_name_function = (
                     display_name  # pylint: disable=protected-access
@@ -286,31 +303,6 @@ class OptionDescriptionWalk(CacheOptionDescription):
         """get children"""
         return self._children[1]
 
-    def get_children_recursively(
-        self,
-        bytype: Optional[BaseOption],
-        byname: Optional[str],
-        config_bag: ConfigBag,
-        self_opt: BaseOption = None,
-        *,
-        option_identifiers: Optional[list] = None,
-    ) -> Iterator[Union[BaseOption]]:
-        """get children recursively"""
-        if self_opt is None:
-            self_opt = self
-        for option in self_opt.get_children():
-            if option.impl_is_optiondescription():
-                for subopt in option.get_children_recursively(
-                    bytype,
-                    byname,
-                    config_bag,
-                ):
-                    yield subopt
-            elif (byname is None or option.impl_getname() == byname) and (
-                bytype is None or isinstance(option, bytype)
-            ):
-                yield option
-
 
 class OptionDescription(OptionDescriptionWalk):
     """Config's schema (organisation, group) and container of Options
@@ -343,35 +335,38 @@ class OptionDescription(OptionDescriptionWalk):
             properties=properties,
         )
         child_names = []
-        if __debug__:
-            dynopt_names = []
+        fix_child_names = []
+        dynopts = []
         for child in children:
             name = child.impl_getname()
             child_names.append(name)
-            if __debug__ and child.impl_is_dynoptiondescription():
-                dynopt_names.append(name)
+            if child.impl_is_dynoptiondescription():
+                dynopts.append(child)
+            else:
+                fix_child_names.append(name)
 
         # before sorting
         children_ = (tuple(child_names), tuple(children))
 
-        if __debug__:
-            # better performance like this
-            child_names.sort()
-            old = None
-            for child in child_names:
-                if child == old:
-                    raise ConflictError(
-                        _("duplicate option name: " '"{0}"').format(child)
+        # better performance like this
+        fix_child_names.sort()
+        old = None
+        for child_name in fix_child_names:
+            if child_name == old:
+                raise ConflictError(
+                    _('the option name "{0}" is duplicate in "{1}"').format(
+                        child_name, self.impl_get_display_name(None)
                     )
-                if dynopt_names:
-                    for dynopt in dynopt_names:
-                        if child != dynopt and child.startswith(dynopt):
-                            raise ConflictError(
-                                _(
-                                    'the option\'s name "{0}" start as the dynoptiondescription\'s name "{1}"'
-                                ).format(child, dynopt)
-                            )
-                old = child
+                )
+            old = child_name
+        for dynopt in dynopts:
+            if dynopt.could_conflict:
+                continue
+            for child in children:
+                if child != dynopt and dynopt.name_could_conflict(dynopt, child):
+                    dynopt.could_conflict.append(weakref.ref(child))
+                    child.could_conflict.append(weakref.ref(dynopt))
+                    break
         self._children = children_
         # the group_type is useful for filtering OptionDescriptions in a config
         self._group_type = None