diff --git a/test/test_config.py b/test/test_config.py
index f660cf5..e9c470f 100644
--- a/test/test_config.py
+++ b/test/test_config.py
@@ -9,7 +9,7 @@ from py.test import raises
 from tiramisu.config import Config
 from tiramisu.option import IntOption, FloatOption, StrOption, ChoiceOption, \
     BoolOption, UnicodeOption, OptionDescription
-from tiramisu.error import ConflictError
+from tiramisu.error import ConflictError, ConfigError
 
 
 def make_description():
@@ -277,4 +277,24 @@ def test_no_validation():
     setting.append('validator')
     raises(ValueError, 'c.test1')
     del(c.test1)
-    assert c.test1 == None
+    assert c.test1 is None
+
+
+def test_delete_config_with_subconfig():
+    test = IntOption('test', '')
+    multi = IntOption('multi', '', multi=True)
+    od = OptionDescription('od', '', [test, multi])
+    odroot = OptionDescription('odroot', '', [od])
+    c = Config(odroot)
+    sub = c.od
+    val = c.cfgimpl_get_values()
+    setting = c.cfgimpl_get_settings()
+    val[test]
+    val[multi]
+    setting[test]
+    sub.make_dict()
+    del(c)
+    raises(ConfigError, 'val[test]')
+    raises(ConfigError, 'val[multi]')
+    raises(ConfigError, 'setting[test]')
+    raises(ConfigError, 'sub.make_dict()')
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 95a7685..5153a2e 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -159,7 +159,15 @@ class SubConfig(object):
     __repr__ = __str__
 
     def _cfgimpl_get_context(self):
-        return self._impl_context()
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self._impl_context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
 
     def cfgimpl_get_description(self):
         if self._impl_descr is None:
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index 76f6a48..80bd064 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -24,7 +24,7 @@ from time import time
 from copy import copy
 import weakref
 from tiramisu.error import (RequirementError, PropertiesOptionError,
-                            ConstError)
+                            ConstError, ConfigError)
 from tiramisu.i18n import _
 
 
@@ -328,6 +328,17 @@ class Settings(object):
         self.context = weakref.ref(context)
         self._p_ = storage
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     #____________________________________________________________
     # properties methods
     def __contains__(self, propname):
@@ -357,7 +368,7 @@ class Settings(object):
             if opt is not None and _path is None:
                 _path = self._get_path_by_opt(opt)
             self._p_.reset_properties(_path)
-        self.context().cfgimpl_reset_cache()
+        self._getcontext().cfgimpl_reset_cache()
 
     def _getproperties(self, opt=None, path=None, is_apply_req=True):
         if opt is None:
@@ -407,14 +418,12 @@ class Settings(object):
         else:
             #if opt._calc_properties is not None:
             #    properties -= opt._calc_properties
-            #FIXME a revoir ---------
             #if set(opt._properties) == properties:
             #    self._p_.reset_properties(path)
             #else:
             #    self._p_.setproperties(path, properties)
             self._p_.setproperties(path, properties)
-            #FIXME fin revoir -----
-        self.context().cfgimpl_reset_cache()
+        self._getcontext().cfgimpl_reset_cache()
 
     #____________________________________________________________
     def validate_properties(self, opt_or_descr, is_descr, is_write, path,
@@ -462,7 +471,7 @@ class Settings(object):
             properties -= frozenset(('mandatory', 'frozen'))
         else:
             if 'mandatory' in properties and \
-                    not self.context().cfgimpl_get_values()._isempty(
+                    not self._getcontext().cfgimpl_get_values()._isempty(
                         opt_or_descr, value):
                 properties.remove('mandatory')
             if is_write and 'everything_frozen' in self_properties:
@@ -585,6 +594,8 @@ class Settings(object):
 
         # filters the callbacks
         calc_properties = set()
+<<<<<<< HEAD
+        context = self._getcontext()
         for require in opt.impl_getrequires():
             expected = tuple(require.get_expected())
             inverse = require.inverse
@@ -596,7 +607,7 @@ class Settings(object):
                                          " '{0}' with requirement on: "
                                          "'{1}'").format(path, reqpath))
             try:
-                value = self.context()._getattr(reqpath,
+                value = context._getattr(reqpath,
                                                 force_permissive=True)
             except PropertiesOptionError as err:
                 if not require.transitive:
@@ -625,7 +636,7 @@ class Settings(object):
         :param opt: `Option`'s object
         :returns: path
         """
-        return self.context().cfgimpl_get_description().impl_get_path_by_opt(opt)
+        return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
 
     def get_modified_properties(self):
         return self._p_.get_modified_properties()
diff --git a/tiramisu/value.py b/tiramisu/value.py
index c969291..30043f7 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -46,13 +46,24 @@ class Values(object):
         # the storage type is dictionary or sqlite3
         self._p_ = storage
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     def _getdefault(self, opt):
         """
         actually retrieves the default value
 
         :param opt: the `option.Option()` object
         """
-        meta = self.context().cfgimpl_get_meta()
+        meta = self._getcontext().cfgimpl_get_meta()
         if meta is not None:
             value = meta.cfgimpl_get_values()[opt]
         else:
@@ -105,11 +116,11 @@ class Values(object):
         if path is None:
             path = self._get_opt_path(opt)
         if self._p_.hasvalue(path):
-            setting = self.context().cfgimpl_get_settings()
+            context = self._getcontext()
+            setting = context.cfgimpl_get_settings()
             opt.impl_validate(opt.impl_getdefault(),
-                              self.context(),
-                              'validator' in setting)
-            self.context().cfgimpl_reset_cache()
+                              context, 'validator' in setting)
+            context.cfgimpl_reset_cache()
             if (opt.impl_is_multi() and
                     opt.impl_get_multitype() == multitypes.master):
                 for slave in opt.impl_get_master_slaves():
@@ -137,7 +148,7 @@ class Values(object):
         callback, callback_params = opt.impl_get_callback()
         if callback_params is None:
             callback_params = {}
-        return carry_out_calculation(opt, config=self.context(),
+        return carry_out_calculation(opt, config=self._getcontext(),
                                      callback=callback,
                                      callback_params=callback_params,
                                      index=index, max_len=max_len)
@@ -151,7 +162,7 @@ class Values(object):
         if path is None:
             path = self._get_opt_path(opt)
         ntime = None
-        setting = self.context().cfgimpl_get_settings()
+        setting = self._getcontext().cfgimpl_get_settings()
         if 'cache' in setting and self._p_.hascache(path):
             if 'expire' in setting:
                 ntime = int(time())
@@ -176,7 +187,8 @@ class Values(object):
     def _getitem(self, opt, path, validate, force_permissive, force_properties,
                  validate_properties):
         # options with callbacks
-        setting = self.context().cfgimpl_get_settings()
+        context = self._getcontext()
+        setting = context.cfgimpl_get_settings()
         is_frozen = 'frozen' in setting[opt]
         # For calculating properties, we need value (ie for mandatory value).
         # If value is calculating with a PropertiesOptionError's option
@@ -196,7 +208,7 @@ class Values(object):
             if (opt.impl_is_multi() and
                     opt.impl_get_multitype() == multitypes.slave):
                 masterp = self._get_opt_path(opt.impl_get_master_slaves())
-                mastervalue = getattr(self.context(), masterp)
+                mastervalue = getattr(context, masterp)
                 lenmaster = len(mastervalue)
                 if lenmaster == 0:
                     value = []
@@ -230,7 +242,7 @@ class Values(object):
         else:
             value = self._getvalue(opt, path, validate)
         if config_error is None and validate:
-            opt.impl_validate(value, self.context(), 'validator' in setting)
+            opt.impl_validate(value, context, 'validator' in setting)
         if config_error is None and self._is_default_owner(path) and \
                 'force_store_value' in setting[opt]:
             self.setitem(opt, value, path, is_write=False)
@@ -251,8 +263,9 @@ class Values(object):
         # is_write is, for example, used with "force_store_value"
         # user didn't change value, so not write
         # valid opt
-        opt.impl_validate(value, self.context(),
-                          'validator' in self.context().cfgimpl_get_settings())
+        context = self._getcontext()
+        opt.impl_validate(value, context,
+                          'validator' in context.cfgimpl_get_settings())
         if opt.impl_is_multi() and not isinstance(value, Multi):
             value = Multi(value, self.context, opt, path, setitem=True)
         self._setvalue(opt, path, value, force_permissive=force_permissive,
@@ -261,14 +274,15 @@ class Values(object):
     def _setvalue(self, opt, path, value, force_permissive=False,
                   force_properties=None,
                   is_write=True, validate_properties=True):
-        self.context().cfgimpl_reset_cache()
+        context = self._getcontext()
+        context.cfgimpl_reset_cache()
         if validate_properties:
-            setting = self.context().cfgimpl_get_settings()
+            setting = context.cfgimpl_get_settings()
             setting.validate_properties(opt, False, is_write,
                                         value=value, path=path,
                                         force_permissive=force_permissive,
                                         force_properties=force_properties)
-        owner = self.context().cfgimpl_get_settings().getowner()
+        owner = context.cfgimpl_get_settings().getowner()
         self._p_.setvalue(path, value, owner)
 
     def getowner(self, opt):
@@ -285,7 +299,7 @@ class Values(object):
 
     def _getowner(self, path):
         owner = self._p_.getowner(path, owners.default)
-        meta = self.context().cfgimpl_get_meta()
+        meta = self._getcontext().cfgimpl_get_meta()
         if owner is owners.default and meta is not None:
             owner = meta.cfgimpl_get_values()._getowner(path)
         return owner
@@ -337,7 +351,7 @@ class Values(object):
         :param opt: the `option.Option` object
         :returns: a string with points like "gc.dummy.my_option"
         """
-        return self.context().cfgimpl_get_description().impl_get_path_by_opt(opt)
+        return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
 
     # information
     def set_information(self, key, value):
@@ -402,12 +416,24 @@ class Multi(list):
             self._valid_master(value)
         super(Multi, self).__init__(value)
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     def _valid_slave(self, value, setitem):
         #if slave, had values until master's one
-        values = self.context().cfgimpl_get_values()
-        masterp = self.context().cfgimpl_get_description().impl_get_path_by_opt(
+        context = self._getcontext()
+        values = context.cfgimpl_get_values()
+        masterp = context.cfgimpl_get_description().impl_get_path_by_opt(
             self.opt.impl_get_master_slaves())
-        mastervalue = getattr(self.context(), masterp)
+        mastervalue = getattr(context, masterp)
         masterlen = len(mastervalue)
         valuelen = len(value)
         is_default_owner = not values._is_default_owner(self.path) or setitem
@@ -431,7 +457,7 @@ class Multi(list):
 
     def _valid_master(self, value):
         masterlen = len(value)
-        values = self.context().cfgimpl_get_values()
+        values = self._getcontext().cfgimpl_get_values()
         for slave in self.opt._master_slaves:
             path = values._get_opt_path(slave)
             if not values._is_default_owner(path):
@@ -458,18 +484,19 @@ class Multi(list):
         self._validate(value, index)
         #assume not checking mandatory property
         super(Multi, self).__setitem__(index, value)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def append(self, value=undefined, force=False):
         """the list value can be updated (appened)
         only if the option is a master
         """
+        context = self._getcontext()
         if not force:
             if self.opt.impl_get_multitype() == multitypes.slave:
                 raise SlaveError(_("cannot append a value on a multi option {0}"
                                    " which is a slave").format(self.opt.impl_getname()))
             elif self.opt.impl_get_multitype() == multitypes.master:
-                values = self.context().cfgimpl_get_values()
+                values = context.cfgimpl_get_values()
                 if value is undefined and self.opt.impl_has_callback():
                     value = values._getcallback_value(self.opt)
                     #Force None il return a list
@@ -480,9 +507,9 @@ class Multi(list):
             value = self.opt.impl_getdefault_multi()
         self._validate(value, index)
         super(Multi, self).append(value)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path,
-                                                      self,
-                                                      validate_properties=not force)
+        context.cfgimpl_get_values()._setvalue(self.opt, self.path,
+                                               self,
+                                               validate_properties=not force)
         if not force and self.opt.impl_get_multitype() == multitypes.master:
             for slave in self.opt.impl_get_master_slaves():
                 path = values._get_opt_path(slave)
@@ -513,7 +540,7 @@ class Multi(list):
             super(Multi, self).sort(key=key, reverse=reverse)
         else:
             super(Multi, self).sort(cmp=cmp, key=key, reverse=reverse)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def reverse(self):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -521,7 +548,7 @@ class Multi(list):
             raise SlaveError(_("cannot reverse multi option {0} if master or "
                                "slave").format(self.opt.impl_getname()))
         super(Multi, self).reverse()
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def insert(self, index, obj):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -529,7 +556,7 @@ class Multi(list):
             raise SlaveError(_("cannot insert multi option {0} if master or "
                                "slave").format(self.opt.impl_getname()))
         super(Multi, self).insert(index, obj)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def extend(self, iterable):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -537,12 +564,12 @@ class Multi(list):
             raise SlaveError(_("cannot extend multi option {0} if master or "
                                "slave").format(self.opt.impl_getname()))
         super(Multi, self).extend(iterable)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def _validate(self, value, force_index):
         if value is not None:
             try:
-                self.opt.impl_validate(value, context=self.context(),
+                self.opt.impl_validate(value, context=self._getcontext(),
                                        force_index=force_index)
             except ValueError as err:
                 raise ValueError(_("invalid value {0} "
@@ -560,13 +587,14 @@ class Multi(list):
         :type force: boolean
         :returns: item at index
         """
+        context = self._getcontext()
         if not force:
             if self.opt.impl_get_multitype() == multitypes.slave:
                 raise SlaveError(_("cannot pop a value on a multi option {0}"
                                    " which is a slave").format(self.opt.impl_getname()))
             elif self.opt.impl_get_multitype() == multitypes.master:
                 for slave in self.opt.impl_get_master_slaves():
-                    values = self.context().cfgimpl_get_values()
+                    values = context.cfgimpl_get_values()
                     if not values.is_default_owner(slave):
                         #get multi without valid properties
                         values.getitem(slave,
@@ -574,5 +602,5 @@ class Multi(list):
                                        ).pop(index, force=True)
         #set value without valid properties
         ret = super(Multi, self).pop(index)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
+        context.cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
         return ret
diff --git a/translations/fr/tiramisu.po b/translations/fr/tiramisu.po
index bff777c..d9bbc3e 100644
--- a/translations/fr/tiramisu.po
+++ b/translations/fr/tiramisu.po
@@ -1,31 +1,26 @@
 msgid ""
 msgstr ""
-"Project-Id-Version: \n"
+"Project-Id-Version: Tiramisu\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2013-09-30 22:49+CEST\n"
+"POT-Creation-Date: 2014-01-25 11:30+CET\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Emmanuel Garette <egarette@cadoles.com>\n"
-"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language-Team: Tiramisu's team <egarette@cadoles.com>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Poedit 1.5.4\n"
+"Language: fr\n"
+"Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"X-Poedit-SourceCharset: UTF-8\n"
 
-#: tiramisu/autolib.py:145
+#: tiramisu/autolib.py:159
 msgid ""
 "unable to carry out a calculation, option {0} has properties: {1} for: {2}"
 msgstr ""
 "impossible d'effectuer le calcul, l'option {0} a les propriétés : {1} pour : "
 "{2}"
 
-#: tiramisu/autolib.py:154
-msgid ""
-"unable to carry out a calculation, option value with multi types must have "
-"same length for: {0}"
-msgstr ""
-"impossible d'effectuer le calcul, la valeur d'une option avec le type multi "
-"doit avoir la même longueur pour : {0}"
-
 #: tiramisu/config.py:52
 msgid "descr must be an optiondescription, not {0}"
 msgstr "descr doit être une optiondescription pas un {0}"
@@ -34,72 +29,77 @@ msgstr "descr doit être une optiondescription pas un {0}"
 msgid "unknown group_type: {0}"
 msgstr "group_type inconnu: {0}"
 
-#: tiramisu/config.py:163
+#: tiramisu/config.py:166 tiramisu/setting.py:339 tiramisu/value.py:57
+#: tiramisu/value.py:427
+msgid "the context does not exist anymore"
+msgstr "le context n'existe plus"
+
+#: tiramisu/config.py:171
 msgid ""
 "no option description found for this config (may be metaconfig without meta)"
 msgstr ""
 "pas d'option description trouvé pour cette config (peut être une metaconfig "
 "sans meta)"
 
-#: tiramisu/config.py:189
+#: tiramisu/config.py:197
 msgid "can't assign to an OptionDescription"
 msgstr "ne peut pas attribuer une valeur à une OptionDescription"
 
-#: tiramisu/config.py:320
+#: tiramisu/config.py:330
 msgid "unknown type_ type {0}for _find"
 msgstr "type_ type {0} pour _find inconnu"
 
-#: tiramisu/config.py:359
+#: tiramisu/config.py:369
 msgid "no option found in config with these criteria"
 msgstr "aucune option trouvée dans la config avec ces critères"
 
-#: tiramisu/config.py:409
+#: tiramisu/config.py:419
 msgid "make_dict can't filtering with value without option"
 msgstr "make_dict ne peut filtrer sur une valeur mais sans option"
 
-#: tiramisu/config.py:430
+#: tiramisu/config.py:440
 msgid "unexpected path {0}, should start with {1}"
 msgstr "chemin imprévu {0}, devrait commencer par {1}"
 
-#: tiramisu/config.py:490
+#: tiramisu/config.py:500
 msgid "opt in getowner must be an option not {0}"
 msgstr "opt dans getowner doit être une option pas {0}"
 
-#: tiramisu/option.py:69
+#: tiramisu/option.py:67
 msgid "invalid name: {0} for option"
 msgstr "nom invalide : {0} pour l'option"
 
-#: tiramisu/option.py:78
+#: tiramisu/option.py:76
 msgid "invalid properties type {0} for {1}, must be a tuple"
 msgstr "type des properties invalide {0} pour {1}, doit être un tuple"
 
-#: tiramisu/option.py:116
+#: tiramisu/option.py:114
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seule"
 
-#: tiramisu/option.py:143 tiramisu/value.py:362
+#: tiramisu/option.py:141 tiramisu/value.py:376
 msgid "information's item not found: {0}"
 msgstr "aucune config spécifié alors que c'est nécessaire"
 
-#: tiramisu/option.py:205
+#: tiramisu/option.py:203
 msgid "cannot serialize Option, only in OptionDescription"
 msgstr "ne peut serialiser une Option, seulement via une OptionDescription"
 
-#: tiramisu/option.py:308
+#: tiramisu/option.py:306
 msgid "a default_multi is set whereas multi is False in option: {0}"
 msgstr ""
 "une default_multi est renseignée alors que multi est False dans l'option : "
 "{0}"
 
-#: tiramisu/option.py:314
+#: tiramisu/option.py:312
 msgid "invalid default_multi value {0} for option {1}: {2}"
 msgstr "la valeur default_multi est invalide {0} pour l'option {1} : {2}"
 
-#: tiramisu/option.py:319
+#: tiramisu/option.py:317
 msgid "default value not allowed if option: {0} is calculated"
 msgstr "la valeur par défaut n'est pas possible si l'option {0} est calculée"
 
-#: tiramisu/option.py:322
+#: tiramisu/option.py:320
 msgid ""
 "params defined for a callback function but no callback defined yet for "
 "option {0}"
@@ -107,72 +107,72 @@ msgstr ""
 "params définis pour une fonction callback mais par de callback encore "
 "définis pour l'option {0}"
 
-#: tiramisu/option.py:361
+#: tiramisu/option.py:359
 msgid "option not in all_cons_opts"
 msgstr "option non présentante dans all_cons_opts"
 
-#: tiramisu/option.py:427 tiramisu/option.py:437
+#: tiramisu/option.py:425 tiramisu/option.py:435
 msgid "invalid value for option {0}: {1}"
 msgstr "valeur invalide pour l'option {0} : {1}"
 
-#: tiramisu/option.py:454
-msgid ""invalid value {0} for option {1} which must be a list"
+#: tiramisu/option.py:452
+msgid "invalid value {0} for option {1} which must be a list"
 msgstr "valeur invalide pour l'option {0} : {1} laquelle doit être une liste"
 
-#: tiramisu/option.py:514
+#: tiramisu/option.py:508
 msgid "consistency should be set with an option"
 msgstr "consistency doit être configuré avec une option"
 
-#: tiramisu/option.py:516
+#: tiramisu/option.py:510
 msgid "cannot add consistency with itself"
 msgstr "ne peut ajouter une consistency avec lui même"
 
-#: tiramisu/option.py:518
+#: tiramisu/option.py:512
 msgid "every options in consistency should be multi or none"
 msgstr ""
 "toutes les options d'une consistency devrait être multi ou ne pas l'être"
 
-#: tiramisu/option.py:538
+#: tiramisu/option.py:532
 msgid "same value for {0} and {1}"
 msgstr "même valeur pour {0} et {1}"
 
-#: tiramisu/option.py:647
+#: tiramisu/option.py:641
 msgid "values must be a tuple for {0}"
 msgstr "values doit être un tuple pour {0}"
 
-#: tiramisu/option.py:650
+#: tiramisu/option.py:644
 msgid "open_values must be a boolean for {0}"
 msgstr "open_values doit être un booléen pour {0}"
 
-#: tiramisu/option.py:672
+#: tiramisu/option.py:666
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr "valeur {0} n'est pas permis, seules {1} sont autorisées"
 
-#: tiramisu/option.py:684
+#: tiramisu/option.py:678
 msgid "invalid boolean"
 msgstr "booléen invalide"
 
-#: tiramisu/option.py:694
+#: tiramisu/option.py:688
 msgid "invalid integer"
 msgstr "nombre invalide"
 
-#: tiramisu/option.py:704
+#: tiramisu/option.py:698
 msgid "invalid float"
 msgstr "invalide nombre flottan"
 
-#: tiramisu/option.py:714
+#: tiramisu/option.py:708
 msgid "invalid string"
 msgstr "invalide caractère"
 
-#: tiramisu/option.py:731
+#: tiramisu/option.py:725
 msgid "invalid unicode"
 msgstr "invalide unicode"
 
-#: tiramisu/option.py:743
+#: tiramisu/option.py:737
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr "symlinkoption mal formé, doit être une option pour symlink {0}"
 
-#: tiramisu/option.py:792
+#: tiramisu/option.py:787 tiramisu/option.py:792
 msgid "invalid IP"
 msgstr "adresse IP invalide"
 
@@ -209,12 +209,12 @@ msgid "invalid len for opts"
 msgstr "longueur invalide pour opts"
 
 #: tiramisu/option.py:927
-msgid "invalid network {0} ({1}) with netmask {2} ({3}), this network is an IP"
-msgstr "réseau invalide {0} ({1}) avec masque {2} ({3}), ce réseau est une IP"
+msgid "invalid network {0} ({1}) with netmask {2}, this network is an IP"
+msgstr "réseau invalide {0} ({1}) avec masque {2}, ce réseau est une IP"
 
 #: tiramisu/option.py:932
-msgid "invalid IP {0} ({1}) with netmask {2} ({3}), this IP is a network"
-msgstr "IP invalide {0} ({1}) avec masque {2} ({3}), cette IP est un réseau"
+msgid "invalid IP {0} ({1}) with netmask {2}, this IP is a network"
+msgstr "IP invalide {0} ({1}) avec masque {2}, cette IP est un réseau"
 
 #: tiramisu/option.py:937
 msgid "invalid IP {0} ({1}) with netmask {2}"
@@ -250,107 +250,108 @@ msgstr "allow_ip doit être un booléen"
 msgid "allow_without_dot must be a boolean"
 msgstr "allow_without_dot doit être un booléen"
 
-#: tiramisu/option.py:1024
+#: tiramisu/option.py:1028
 msgid "invalid domainname, must have dot"
 msgstr "nom de domaine invalide, doit avoir un point"
 
-#: tiramisu/option.py:1026
+#: tiramisu/option.py:1030
 msgid "invalid domainname's length (max 255)"
 msgstr "longueur du nom de domaine invalide (maximum {1})"
 
-#: tiramisu/option.py:1028
+#: tiramisu/option.py:1032
 msgid "invalid domainname's length (min 2)"
 msgstr "longueur du nom de domaine invalide (minimum 2)"
 
-#: tiramisu/option.py:1030
+#: tiramisu/option.py:1034
 msgid "invalid domainname"
 msgstr "nom de domaine invalide"
 
-#: tiramisu/option.py:1049
+#: tiramisu/option.py:1047
 msgid "invalid email address, should contains one @"
 msgstr "adresse email invalide, devrait contenir un @"
 
-#: tiramisu/option.py:1052
+#: tiramisu/option.py:1050
 msgid "invalid username in email address"
 msgstr "nom d'utilisateur invalide dans une adresse email"
 
-#: tiramisu/option.py:1071
+#: tiramisu/option.py:1063
 msgid "invalid url, should start with http:// or https://"
 msgstr "URL invalide, devrait démarré avec http:// ou https://"
 
-#: tiramisu/option.py:1090
+#: tiramisu/option.py:1082
 msgid "invalid url, port must be an between 0 and 65536"
 msgstr "URL invalide, port doit être entre 0 et 65536"
 
-#: tiramisu/option.py:1096
-#, fuzzy
+#: tiramisu/option.py:1088
 msgid "invalid url, should ends with filename"
 msgstr "URL invalide, devrait finir avec un nom de fichier"
 
-#: tiramisu/option.py:1107
+#: tiramisu/option.py:1099
 msgid "invalid filename"
 msgstr "nom de fichier invalide"
 
-#: tiramisu/option.py:1134
+#: tiramisu/option.py:1126
 msgid "duplicate option name: {0}"
 msgstr "nom de l'option dupliqué : {0}"
 
-#: tiramisu/option.py:1152
+#: tiramisu/option.py:1144
 msgid "unknown Option {0} in OptionDescription {1}"
 msgstr "Option {0} inconnue pour l'OptionDescription {1}"
 
-#: tiramisu/option.py:1203
+#: tiramisu/option.py:1195
 msgid "duplicate option: {0}"
 msgstr "option dupliquée : {0}"
 
-#: tiramisu/option.py:1233
+#: tiramisu/option.py:1225
 msgid "consistency with option {0} which is not in Config"
 msgstr "consistency avec l'option {0} qui n'est pas dans une Config"
 
-#: tiramisu/option.py:1241
+#: tiramisu/option.py:1233
 msgid "no option for path {0}"
 msgstr "pas d'option pour le chemin {0}"
 
-#: tiramisu/option.py:1247
+#: tiramisu/option.py:1239
 msgid "no option {0} found"
 msgstr "pas d'option {0} trouvée"
 
-#: tiramisu/option.py:1257
+#: tiramisu/option.py:1249
 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.py:1270
+#: tiramisu/option.py:1261
 msgid "master group {0} shall not have a subgroup"
 msgstr "groupe maître {0} ne doit pas avoir de sous-groupe"
 
-#: tiramisu/option.py:1273
+#: tiramisu/option.py:1264
 msgid "master group {0} shall not have a symlinkoption"
 msgstr "groupe maître {0} ne doit pas avoir de symlinkoption"
 
-#: tiramisu/option.py:1276
+#: tiramisu/option.py:1267
 msgid "not allowed option {0} in group {1}: this option is not a multi"
 msgstr ""
 "option non autorisée {0} dans le groupe {1} : cette option n'est pas une "
 "multi"
 
-#: tiramisu/option.py:1287
+#: tiramisu/option.py:1277
 msgid "master group with wrong master name for {0}"
 msgstr "le groupe maître avec un nom de maître érroné pour {0}"
 
-#: tiramisu/option.py:1296
-msgid "no child has same nom has master group for: {0}"
-msgstr "pas d'enfant avec le nom du groupe maître pour {0} "
+#: tiramisu/option.py:1285
+msgid "callback of master's option shall not refered a slave's ones"
+msgstr ""
+"callback d'une variable maitre ne devrait pas référencer des variables "
+"esclaves"
 
-#: tiramisu/option.py:1299
+#: tiramisu/option.py:1293
 msgid "group_type: {0} not allowed"
 msgstr "group_type : {0} non autorisé"
 
-#: tiramisu/option.py:1391
+#: tiramisu/option.py:1385
 msgid "malformed requirements type for option: {0}, must be a dict"
 msgstr ""
 "type requirements malformé pour l'option : {0}, doit être un dictionnaire"
 
-#: tiramisu/option.py:1408
+#: tiramisu/option.py:1402
 msgid ""
 "malformed requirements for option: {0} require must have option, expected "
 "and action keys"
@@ -358,66 +359,66 @@ msgstr ""
 "requirements malformé pour l'option : {0} l'exigence doit avoir les clefs "
 "option, expected et action"
 
-#: tiramisu/option.py:1413
+#: tiramisu/option.py:1407
 msgid "malformed requirements for option: {0} inverse must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} inverse doit être un booléen"
 
-#: tiramisu/option.py:1417
+#: tiramisu/option.py:1411
 msgid "malformed requirements for option: {0} transitive must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} transitive doit être booléen"
 
-#: tiramisu/option.py:1421
+#: tiramisu/option.py:1415
 msgid "malformed requirements for option: {0} same_action must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} same_action doit être un booléen"
 
-#: tiramisu/option.py:1425
+#: tiramisu/option.py:1419
 msgid "malformed requirements must be an option in option {0}"
 msgstr "requirements mal formés doit être une option dans l'option {0}"
 
-#: tiramisu/option.py:1428
+#: tiramisu/option.py:1422
 msgid "malformed requirements option {0} should not be a multi"
 msgstr "requirements mal formés l'option {0} ne doit pas être une multi"
 
-#: tiramisu/option.py:1434
+#: tiramisu/option.py:1428
 msgid ""
 "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 "requirements mal formés deuxième argument doit être valide pour l'option "
 "{0} : {1}"
 
-#: tiramisu/option.py:1439
+#: tiramisu/option.py:1433
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr "incohérence dans les types action pour l'option : {0} action {1}"
 
-#: tiramisu/option.py:1464
+#: tiramisu/option.py:1458
 msgid "{0} should be a function"
 msgstr "{0} doit être une fonction"
 
-#: tiramisu/option.py:1467
+#: tiramisu/option.py:1461
 msgid "{0}_params should be a dict"
 msgstr "{0}_params devrait être un dict"
 
-#: tiramisu/option.py:1470
+#: tiramisu/option.py:1464
 msgid "{0}_params with key {1} should not have length different to 1"
 msgstr ""
 "{0}_params avec la clef {1} devrait ne pas avoir une longueur différent de 1"
 
-#: tiramisu/option.py:1474
+#: tiramisu/option.py:1468
 msgid "{0}_params should be tuple for key \"{1}\""
 msgstr "{0}_params devrait être un tuple pour la clef \"{1}\""
 
-#: tiramisu/option.py:1480
+#: tiramisu/option.py:1474
 msgid "validator not support tuple"
 msgstr "validator n'accepte pas de tuple"
 
-#: tiramisu/option.py:1483
+#: tiramisu/option.py:1477
 msgid "{0}_params should have an option not a {0} for first argument"
 msgstr "{0}_params devrait avoir une option pas un {0} pour premier argument"
 
-#: tiramisu/option.py:1487
+#: tiramisu/option.py:1481
 msgid "{0}_params should have a boolean not a {0} for second argument"
 msgstr "{0}_params devrait avoir un boolean pas un {0} pour second argument"
 
@@ -429,39 +430,39 @@ msgstr "ne peut redéfinir ({0})"
 msgid "can't unbind {0}"
 msgstr "ne peut supprimer ({0})"
 
-#: tiramisu/setting.py:259
+#: tiramisu/setting.py:272
 msgid "cannot append {0} property for option {1}: this property is calculated"
 msgstr ""
 "ne peut ajouter la propriété {0} dans l'option {1}: cette propriété est "
 "calculée"
 
-#: tiramisu/setting.py:322
+#: tiramisu/setting.py:363
 msgid "opt and all_properties must not be set together in reset"
 msgstr "opt et all_properties ne doit pas être renseigné ensemble dans reset"
 
-#: tiramisu/setting.py:337
+#: tiramisu/setting.py:378
 msgid "if opt is not None, path should not be None in _getproperties"
 msgstr ""
 "si opt n'est pas None, path devrait ne pas être à None dans _getproperties"
 
-#: tiramisu/setting.py:440
+#: tiramisu/setting.py:483
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 "ne peut modifier la valeur de l'option {0} cette option n'est pas modifiable"
 
-#: tiramisu/setting.py:446
+#: tiramisu/setting.py:489
 msgid "trying to access to an option named: {0} with properties {1}"
 msgstr "tentative d'accès à une option nommée : {0} avec les propriétés {1}"
 
-#: tiramisu/setting.py:464
+#: tiramisu/setting.py:507
 msgid "permissive must be a tuple"
 msgstr "permissive doit être un tuple"
 
-#: tiramisu/setting.py:471 tiramisu/value.py:301
+#: tiramisu/setting.py:514 tiramisu/value.py:315
 msgid "invalid generic owner {0}"
 msgstr "invalide owner générique {0}"
 
-#: tiramisu/setting.py:558
+#: tiramisu/setting.py:602
 msgid ""
 "malformed requirements imbrication detected for option: '{0}' with "
 "requirement on: '{1}'"
@@ -469,7 +470,7 @@ msgstr ""
 "imbrication de requirements mal formés detectée pour l'option : '{0}' avec "
 "requirement sur : '{1}'"
 
-#: tiramisu/setting.py:570
+#: tiramisu/setting.py:613
 msgid "option '{0}' has requirement's property error: {1} {2}"
 msgstr "l'option '{0}' a une erreur de propriété pour le requirement : {1} {2}"
 
@@ -494,52 +495,62 @@ msgstr "session déjà utilisée"
 msgid "a dictionary cannot be persistent"
 msgstr "un espace de stockage dictionary ne peut être persistant"
 
-#: tiramisu/value.py:308
+#: tiramisu/value.py:322
 msgid "no value for {0} cannot change owner to {1}"
 msgstr "pas de valeur pour {0} ne peut changer d'utilisateur pour {1}"
 
-#: tiramisu/value.py:416
+#: tiramisu/value.py:442
 msgid "invalid len for the slave: {0} which has {1} as master"
 msgstr "longueur invalide pour une esclave : {0} qui a {1} comme maître"
 
-#: tiramisu/value.py:440
+#: tiramisu/value.py:466
 msgid "invalid len for the master: {0} which has {1} as slave with greater len"
 msgstr ""
 "longueur invalide pour un maître : {0} qui a {1} une esclave avec une plus "
 "grande longueur"
 
-#: tiramisu/value.py:470
+#: tiramisu/value.py:496
 msgid "cannot append a value on a multi option {0} which is a slave"
 msgstr "ne peut ajouter une valeur sur l'option multi {0} qui est une esclave"
 
-#: tiramisu/value.py:507
+#: tiramisu/value.py:535
 msgid "cannot sort multi option {0} if master or slave"
 msgstr "ne peut trier une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:511
+#: tiramisu/value.py:539
 msgid "cmp is not permitted in python v3 or greater"
 msgstr "cmp n'est pas permis en python v3 ou supérieure"
 
-#: tiramisu/value.py:520
+#: tiramisu/value.py:548
 msgid "cannot reverse multi option {0} if master or slave"
 msgstr "ne peut inverser une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:528
+#: tiramisu/value.py:556
 msgid "cannot insert multi option {0} if master or slave"
 msgstr "ne peut insérer une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:536
+#: tiramisu/value.py:564
 msgid "cannot extend multi option {0} if master or slave"
 msgstr "ne peut étendre une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:547
+#: tiramisu/value.py:575
 msgid "invalid value {0} for option {1}: {2}"
 msgstr "valeur invalide {0} pour l'option {1} : {2}"
 
-#: tiramisu/value.py:564
+#: tiramisu/value.py:593
 msgid "cannot pop a value on a multi option {0} which is a slave"
 msgstr "ne peut supprimer une valeur dans l'option multi {0} qui est esclave"
 
+#~ msgid ""
+#~ "unable to carry out a calculation, option value with multi types must "
+#~ "have same length for: {0}"
+#~ msgstr ""
+#~ "impossible d'effectuer le calcul, la valeur d'une option avec le type "
+#~ "multi doit avoir la même longueur pour : {0}"
+
+#~ msgid "no child has same nom has master group for: {0}"
+#~ msgstr "pas d'enfant avec le nom du groupe maître pour {0} "
+
 #~ msgid "value must be a boolean"
 #~ msgstr "valeur doit être un booléen"
 
@@ -555,9 +566,6 @@ msgstr "ne peut supprimer une valeur dans l'option multi {0} qui est esclave"
 #~ msgid "value must be an unicode"
 #~ msgstr "valeur doit être une valeur unicode"
 
-#~ msgid "invalid value {0} for option {1} which must be a list"
-#~ msgstr "valeur invalide {0} pour l'option {1} qui doit être une liste"
-
 #~ msgid "invalid value {0} for option {1} must be different as {2} option"
 #~ msgstr ""
 #~ "valeur invalide {0} pour l'option {1} doit être différente de l'option {2}"
diff --git a/translations/tiramisu.pot b/translations/tiramisu.pot
index 89808a9..e572a40 100644
--- a/translations/tiramisu.pot
+++ b/translations/tiramisu.pot
@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2013-09-30 22:49+CEST\n"
+"POT-Creation-Date: 2014-01-25 11:30+CET\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"
@@ -15,14 +15,10 @@ msgstr ""
 "Generated-By: pygettext.py 1.5\n"
 
 
-#: tiramisu/autolib.py:145
+#: tiramisu/autolib.py:159
 msgid "unable to carry out a calculation, option {0} has properties: {1} for: {2}"
 msgstr ""
 
-#: tiramisu/autolib.py:154
-msgid "unable to carry out a calculation, option value with multi types must have same length for: {0}"
-msgstr ""
-
 #: tiramisu/config.py:52
 msgid "descr must be an optiondescription, not {0}"
 msgstr ""
@@ -31,135 +27,140 @@ msgstr ""
 msgid "unknown group_type: {0}"
 msgstr ""
 
-#: tiramisu/config.py:163
+#: tiramisu/config.py:166 tiramisu/setting.py:339 tiramisu/value.py:57
+#: tiramisu/value.py:427
+msgid "the context does not exist anymore"
+msgstr ""
+
+#: tiramisu/config.py:171
 msgid "no option description found for this config (may be metaconfig without meta)"
 msgstr ""
 
-#: tiramisu/config.py:189
+#: tiramisu/config.py:197
 msgid "can't assign to an OptionDescription"
 msgstr ""
 
-#: tiramisu/config.py:320
+#: tiramisu/config.py:330
 msgid "unknown type_ type {0}for _find"
 msgstr ""
 
-#: tiramisu/config.py:359
+#: tiramisu/config.py:369
 msgid "no option found in config with these criteria"
 msgstr ""
 
-#: tiramisu/config.py:409
+#: tiramisu/config.py:419
 msgid "make_dict can't filtering with value without option"
 msgstr ""
 
-#: tiramisu/config.py:430
+#: tiramisu/config.py:440
 msgid "unexpected path {0}, should start with {1}"
 msgstr ""
 
-#: tiramisu/config.py:490
+#: tiramisu/config.py:500
 msgid "opt in getowner must be an option not {0}"
 msgstr ""
 
-#: tiramisu/option.py:69
+#: tiramisu/option.py:67
 msgid "invalid name: {0} for option"
 msgstr ""
 
-#: tiramisu/option.py:78
+#: tiramisu/option.py:76
 msgid "invalid properties type {0} for {1}, must be a tuple"
 msgstr ""
 
-#: tiramisu/option.py:116
+#: tiramisu/option.py:114
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr ""
 
-#: tiramisu/option.py:143 tiramisu/value.py:362
+#: tiramisu/option.py:141 tiramisu/value.py:376
 msgid "information's item not found: {0}"
 msgstr ""
 
-#: tiramisu/option.py:205
+#: tiramisu/option.py:203
 msgid "cannot serialize Option, only in OptionDescription"
 msgstr ""
 
-#: tiramisu/option.py:308
+#: tiramisu/option.py:306
 msgid "a default_multi is set whereas multi is False in option: {0}"
 msgstr ""
 
-#: tiramisu/option.py:314
+#: tiramisu/option.py:312
 msgid "invalid default_multi value {0} for option {1}: {2}"
 msgstr ""
 
-#: tiramisu/option.py:319
+#: tiramisu/option.py:317
 msgid "default value not allowed if option: {0} is calculated"
 msgstr ""
 
-#: tiramisu/option.py:322
+#: tiramisu/option.py:320
 msgid "params defined for a callback function but no callback defined yet for option {0}"
 msgstr ""
 
-#: tiramisu/option.py:361
+#: tiramisu/option.py:359
 msgid "option not in all_cons_opts"
 msgstr ""
 
-#: tiramisu/option.py:427 tiramisu/option.py:437
+#: tiramisu/option.py:425 tiramisu/option.py:435
 msgid "invalid value for option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:454
-msgid "which must be a list"
+#: tiramisu/option.py:452
+msgid "invalid value {0} for option {1} which must be a list"
 msgstr ""
 
-#: tiramisu/option.py:514
+#: tiramisu/option.py:508
 msgid "consistency should be set with an option"
 msgstr ""
 
-#: tiramisu/option.py:516
+#: tiramisu/option.py:510
 msgid "cannot add consistency with itself"
 msgstr ""
 
-#: tiramisu/option.py:518
+#: tiramisu/option.py:512
 msgid "every options in consistency should be multi or none"
 msgstr ""
 
-#: tiramisu/option.py:538
+#: tiramisu/option.py:532
 msgid "same value for {0} and {1}"
 msgstr ""
 
-#: tiramisu/option.py:647
+#: tiramisu/option.py:641
 msgid "values must be a tuple for {0}"
 msgstr ""
 
-#: tiramisu/option.py:650
+#: tiramisu/option.py:644
 msgid "open_values must be a boolean for {0}"
 msgstr ""
 
-#: tiramisu/option.py:672
+#: tiramisu/option.py:666
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr ""
 
-#: tiramisu/option.py:684
+#: tiramisu/option.py:678
 msgid "invalid boolean"
 msgstr ""
 
-#: tiramisu/option.py:694
+#: tiramisu/option.py:688
 msgid "invalid integer"
 msgstr ""
 
-#: tiramisu/option.py:704
+#: tiramisu/option.py:698
 msgid "invalid float"
 msgstr ""
 
-#: tiramisu/option.py:714
+#: tiramisu/option.py:708
 msgid "invalid string"
 msgstr ""
 
-#: tiramisu/option.py:731
+#: tiramisu/option.py:725
 msgid "invalid unicode"
 msgstr ""
 
-#: tiramisu/option.py:743
+#: tiramisu/option.py:737
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr ""
 
-#: tiramisu/option.py:792
+#: tiramisu/option.py:787 tiramisu/option.py:792
 msgid "invalid IP"
 msgstr ""
 
@@ -196,11 +197,11 @@ msgid "invalid len for opts"
 msgstr ""
 
 #: tiramisu/option.py:927
-msgid "invalid network {0} ({1}) with netmask {2} ({3}), this network is an IP"
+msgid "invalid network {0} ({1}) with netmask {2}, this network is an IP"
 msgstr ""
 
 #: tiramisu/option.py:932
-msgid "invalid IP {0} ({1}) with netmask {2} ({3}), this IP is a network"
+msgid "invalid IP {0} ({1}) with netmask {2}, this IP is a network"
 msgstr ""
 
 #: tiramisu/option.py:937
@@ -235,159 +236,159 @@ msgstr ""
 msgid "allow_without_dot must be a boolean"
 msgstr ""
 
-#: tiramisu/option.py:1024
+#: tiramisu/option.py:1028
 msgid "invalid domainname, must have dot"
 msgstr ""
 
-#: tiramisu/option.py:1026
+#: tiramisu/option.py:1030
 msgid "invalid domainname's length (max 255)"
 msgstr ""
 
-#: tiramisu/option.py:1028
+#: tiramisu/option.py:1032
 msgid "invalid domainname's length (min 2)"
 msgstr ""
 
-#: tiramisu/option.py:1030
+#: tiramisu/option.py:1034
 msgid "invalid domainname"
 msgstr ""
 
-#: tiramisu/option.py:1049
+#: tiramisu/option.py:1047
 msgid "invalid email address, should contains one @"
 msgstr ""
 
-#: tiramisu/option.py:1052
+#: tiramisu/option.py:1050
 msgid "invalid username in email address"
 msgstr ""
 
-#: tiramisu/option.py:1071
+#: tiramisu/option.py:1063
 msgid "invalid url, should start with http:// or https://"
 msgstr ""
 
-#: tiramisu/option.py:1090
+#: tiramisu/option.py:1082
 msgid "invalid url, port must be an between 0 and 65536"
 msgstr ""
 
-#: tiramisu/option.py:1096
+#: tiramisu/option.py:1088
 msgid "invalid url, should ends with filename"
 msgstr ""
 
-#: tiramisu/option.py:1107
+#: tiramisu/option.py:1099
 msgid "invalid filename"
 msgstr ""
 
-#: tiramisu/option.py:1134
+#: tiramisu/option.py:1126
 msgid "duplicate option name: {0}"
 msgstr ""
 
-#: tiramisu/option.py:1152
+#: tiramisu/option.py:1144
 msgid "unknown Option {0} in OptionDescription {1}"
 msgstr ""
 
-#: tiramisu/option.py:1203
+#: tiramisu/option.py:1195
 msgid "duplicate option: {0}"
 msgstr ""
 
-#: tiramisu/option.py:1233
+#: tiramisu/option.py:1225
 msgid "consistency with option {0} which is not in Config"
 msgstr ""
 
-#: tiramisu/option.py:1241
+#: tiramisu/option.py:1233
 msgid "no option for path {0}"
 msgstr ""
 
-#: tiramisu/option.py:1247
+#: tiramisu/option.py:1239
 msgid "no option {0} found"
 msgstr ""
 
-#: tiramisu/option.py:1257
+#: tiramisu/option.py:1249
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr ""
 
-#: tiramisu/option.py:1270
+#: tiramisu/option.py:1261
 msgid "master group {0} shall not have a subgroup"
 msgstr ""
 
-#: tiramisu/option.py:1273
+#: tiramisu/option.py:1264
 msgid "master group {0} shall not have a symlinkoption"
 msgstr ""
 
-#: tiramisu/option.py:1276
+#: tiramisu/option.py:1267
 msgid "not allowed option {0} in group {1}: this option is not a multi"
 msgstr ""
 
-#: tiramisu/option.py:1287
+#: tiramisu/option.py:1277
 msgid "master group with wrong master name for {0}"
 msgstr ""
 
-#: tiramisu/option.py:1296
-msgid "no child has same nom has master group for: {0}"
+#: tiramisu/option.py:1285
+msgid "callback of master's option shall not refered a slave's ones"
 msgstr ""
 
-#: tiramisu/option.py:1299
+#: tiramisu/option.py:1293
 msgid "group_type: {0} not allowed"
 msgstr ""
 
-#: tiramisu/option.py:1391
+#: tiramisu/option.py:1385
 msgid "malformed requirements type for option: {0}, must be a dict"
 msgstr ""
 
-#: tiramisu/option.py:1408
+#: tiramisu/option.py:1402
 msgid "malformed requirements for option: {0} require must have option, expected and action keys"
 msgstr ""
 
-#: tiramisu/option.py:1413
+#: tiramisu/option.py:1407
 msgid "malformed requirements for option: {0} inverse must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1417
+#: tiramisu/option.py:1411
 msgid "malformed requirements for option: {0} transitive must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1421
+#: tiramisu/option.py:1415
 msgid "malformed requirements for option: {0} same_action must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1425
+#: tiramisu/option.py:1419
 msgid "malformed requirements must be an option in option {0}"
 msgstr ""
 
-#: tiramisu/option.py:1428
+#: tiramisu/option.py:1422
 msgid "malformed requirements option {0} should not be a multi"
 msgstr ""
 
-#: tiramisu/option.py:1434
+#: tiramisu/option.py:1428
 msgid "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:1439
+#: tiramisu/option.py:1433
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr ""
 
-#: tiramisu/option.py:1464
+#: tiramisu/option.py:1458
 msgid "{0} should be a function"
 msgstr ""
 
-#: tiramisu/option.py:1467
+#: tiramisu/option.py:1461
 msgid "{0}_params should be a dict"
 msgstr ""
 
-#: tiramisu/option.py:1470
+#: tiramisu/option.py:1464
 msgid "{0}_params with key {1} should not have length different to 1"
 msgstr ""
 
-#: tiramisu/option.py:1474
+#: tiramisu/option.py:1468
 msgid "{0}_params should be tuple for key \"{1}\""
 msgstr ""
 
-#: tiramisu/option.py:1480
+#: tiramisu/option.py:1474
 msgid "validator not support tuple"
 msgstr ""
 
-#: tiramisu/option.py:1483
+#: tiramisu/option.py:1477
 msgid "{0}_params should have an option not a {0} for first argument"
 msgstr ""
 
-#: tiramisu/option.py:1487
+#: tiramisu/option.py:1481
 msgid "{0}_params should have a boolean not a {0} for second argument"
 msgstr ""
 
@@ -399,39 +400,39 @@ msgstr ""
 msgid "can't unbind {0}"
 msgstr ""
 
-#: tiramisu/setting.py:259
+#: tiramisu/setting.py:272
 msgid "cannot append {0} property for option {1}: this property is calculated"
 msgstr ""
 
-#: tiramisu/setting.py:322
+#: tiramisu/setting.py:363
 msgid "opt and all_properties must not be set together in reset"
 msgstr ""
 
-#: tiramisu/setting.py:337
+#: tiramisu/setting.py:378
 msgid "if opt is not None, path should not be None in _getproperties"
 msgstr ""
 
-#: tiramisu/setting.py:440
+#: tiramisu/setting.py:483
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 
-#: tiramisu/setting.py:446
+#: tiramisu/setting.py:489
 msgid "trying to access to an option named: {0} with properties {1}"
 msgstr ""
 
-#: tiramisu/setting.py:464
+#: tiramisu/setting.py:507
 msgid "permissive must be a tuple"
 msgstr ""
 
-#: tiramisu/setting.py:471 tiramisu/value.py:301
+#: tiramisu/setting.py:514 tiramisu/value.py:315
 msgid "invalid generic owner {0}"
 msgstr ""
 
-#: tiramisu/setting.py:558
+#: tiramisu/setting.py:602
 msgid "malformed requirements imbrication detected for option: '{0}' with requirement on: '{1}'"
 msgstr ""
 
-#: tiramisu/setting.py:570
+#: tiramisu/setting.py:613
 msgid "option '{0}' has requirement's property error: {1} {2}"
 msgstr ""
 
@@ -455,47 +456,47 @@ msgstr ""
 msgid "a dictionary cannot be persistent"
 msgstr ""
 
-#: tiramisu/value.py:308
+#: tiramisu/value.py:322
 msgid "no value for {0} cannot change owner to {1}"
 msgstr ""
 
-#: tiramisu/value.py:416
+#: tiramisu/value.py:442
 msgid "invalid len for the slave: {0} which has {1} as master"
 msgstr ""
 
-#: tiramisu/value.py:440
+#: tiramisu/value.py:466
 msgid "invalid len for the master: {0} which has {1} as slave with greater len"
 msgstr ""
 
-#: tiramisu/value.py:470
+#: tiramisu/value.py:496
 msgid "cannot append a value on a multi option {0} which is a slave"
 msgstr ""
 
-#: tiramisu/value.py:507
+#: tiramisu/value.py:535
 msgid "cannot sort multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:511
+#: tiramisu/value.py:539
 msgid "cmp is not permitted in python v3 or greater"
 msgstr ""
 
-#: tiramisu/value.py:520
+#: tiramisu/value.py:548
 msgid "cannot reverse multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:528
+#: tiramisu/value.py:556
 msgid "cannot insert multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:536
+#: tiramisu/value.py:564
 msgid "cannot extend multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:547
+#: tiramisu/value.py:575
 msgid "invalid value {0} for option {1}: {2}"
 msgstr ""
 
-#: tiramisu/value.py:564
+#: tiramisu/value.py:593
 msgid "cannot pop a value on a multi option {0} which is a slave"
 msgstr ""