diff --git a/test/api/test_owner.py b/test/api/test_owner.py
index 8a5ea94..679e864 100644
--- a/test/api/test_owner.py
+++ b/test/api/test_owner.py
@@ -138,18 +138,15 @@ def autocheck_value(api, path, **kwargs):
     if not kwargs.get('permissive', False) and not kwargs.get('propertyerror', False):
         if ismaster:
             raises(APIError, "api.option(path, 0).value.set(first_value[0])")
-            api.option(path).value.append(first_value[0])
+            api.option(path).value.set([first_value[0]])
         elif isslave:
-            #FIXME
-            print(api.option(path).value.append(first_value[0]))
-            raises(PropertiesOptionError, "api.option(path).value.append(first_value[0])")
             api.option(path, 0).value.set(first_value[0])
             raise Exception('pouet')
         else:
             api.option(path).value.set(first_value)
     else:
         if ismaster:
-            raises(PropertiesOptionError, "api.option(path).value.append(first_value[0])")
+            raises(PropertiesOptionError, "api.option(path).value.set([first_value[0]])")
         elif isslave:
             raises(PropertiesOptionError, "api.option(path, 0).value.set(first_value[0])")
         else:
@@ -180,31 +177,30 @@ def autocheck_value(api, path, **kwargs):
     if ismaster:
         raises(APIError, "api.unrestraint.option(path).value.set(second_value[1])")
     elif isslave:
-        raises(APIError, "api.unrestraint.option(path).value.append(second_value[1])")
+        raises(APIError, "api.unrestraint.option(path).value.set([first_value[0], second_value[1]])")
     else:
         raises(APIError, "api.unrestraint.option(path).value.set(second_value)")
     if not kwargs.get('permissive', False) and not kwargs.get('propertyerror', False):
         if ismaster:
             raises(APIError, "api.forcepermissive.option(path, 1).value.set(second_value[1])")
-            api.forcepermissive.option(path).value.append(second_value[1])
+            api.forcepermissive.option(path).value.set([first_value[0], second_value[1]])
         elif isslave:
             #FIXME
-            raises(PropertiesOptionError, "api.forcepermissive.option(path).value.append(second_value[1])")
+            raises(PropertiesOptionError, "api.forcepermissive.option(path).value.set([first_value[0], second_value[1]])")
             api.option(path, 1).value.set(second_value[1])
             raise Exception('ca entre ici')
         else:
             api.option(path).value.set(second_value)
     elif kwargs.get('permissive', False):
         if ismaster:
-            api.forcepermissive.option(path).value.append(second_value[0])
-            api.forcepermissive.option(path).value.append(second_value[1])
+            api.forcepermissive.option(path).value.set([first_value[0], second_value[1]])
         elif isslave:
             api.forcepermissive.option(path, 1).value.set(second_value[1])
         else:
             api.forcepermissive.option(path).value.set(first_value)
     else:
         if ismaster:
-            raises(PropertiesOptionError, "api.forcepermissive.option(path).value.append(first_value[0])")
+            raises(PropertiesOptionError, "api.forcepermissive.option(path).value.set([first_value[0]])")
         elif isslave:
             raises(PropertiesOptionError, "api.forcepermissive.option(path, 0).value.set(first_value[0])")
         else:
@@ -240,15 +236,8 @@ def autocheck_value(api, path, **kwargs):
 @autocheck
 def autocheck_reset_value(api, path, **kwargs):
     # check if is a multi, a master or a slave
-    if not kwargs.get('propertyerror', False):
-        multi = api.forcepermissive.option(path).option.ismulti()
-        ismaster = api.forcepermissive.option(path).option.ismaster()
-        isslave = api.forcepermissive.option(path).option.isslave()
-    else:
-        raises(PropertiesOptionError, "api.forcepermissive.option(path).option.ismulti()")
-        multi = api.unrestraint.option(path).option.ismulti()
-        ismaster = api.unrestraint.option(path).option.ismaster()
-        isslave = api.unrestraint.option(path).option.isslave()
+    multi = api.unrestraint.option(path).option.ismulti()
+    isslave = api.unrestraint.option(path).option.isslave()
 
     # set default value (different if value is multi or not)
     if not multi:
@@ -337,14 +326,8 @@ def autocheck_property(api, path, **kwargs):
     """get property from path
     """
     # check if is a multi or a slave
-    if not kwargs.get('propertyerror', False):
-        multi = api.forcepermissive.option(path).option.ismulti()
-        isslave = api.forcepermissive.option(path).option.isslave()
-    else:
-        raises(PropertiesOptionError, "api.forcepermissive.option(path).option.ismulti()")
-        raises(PropertiesOptionError, "api.forcepermissive.option(path).option.isslave()")
-        multi = api.unrestraint.option(path).option.ismulti()
-        isslave = api.unrestraint.option(path).option.isslave()
+    multi = api.unrestraint.option(path).option.ismulti()
+    isslave = api.unrestraint.option(path).option.isslave()
 
     # define properties
     properties = ['prop1', 'prop2']
@@ -367,7 +350,10 @@ def autocheck_property(api, path, **kwargs):
             assert set(api.option(path, 0).property.get()) == set(default_props)
             assert set(api.option(path, 1).property.get()) == set(default_props)
     else:
-        raises(PropertiesOptionError, "api.option(path).property.get()")
+        if not isslave:
+            raises(PropertiesOptionError, "api.option(path).property.get()")
+        else:
+            raises(PropertiesOptionError, "api.option(path, 0).property.get()")
 
     # get properties with permissive
     if not isslave:
@@ -390,17 +376,21 @@ def autocheck_property(api, path, **kwargs):
     if not kwargs.get('permissive', False) and not kwargs.get('propertyerror', False):
         api.option(path).property.set(properties)
     else:
-        raises(PropertiesOptionError, "api.option(path).property.set(properties)")
+        if not isslave:
+            raises(PropertiesOptionError, "api.option(path).property.set(properties)")
+        else:
+            raises(PropertiesOptionError, "api.option(path, 0).property.set(properties)")
 
     # check properties after set without permissive
     if not kwargs.get('permissive', False) and not kwargs.get('propertyerror', False):
         assert set(api.option(path).property.get()) == set(properties)
         assert set(api.forcepermissive.option(path).property.get()) == set(properties)
     elif kwargs.get('permissive', False):
-        raises(PropertiesOptionError, "api.option(path).property.get()")
         if not isslave:
+            raises(PropertiesOptionError, "api.option(path).property.get()")
             assert set(api.forcepermissive.option(path).property.get()) == set(default_props)
         else:
+            raises(PropertiesOptionError, "api.option(path, 0).property.get()")
             assert set(api.forcepermissive.option(path, 0).property.get()) == set(default_props)
             assert set(api.forcepermissive.option(path, 1).property.get()) == set(default_props)
     else:
@@ -588,7 +578,8 @@ def autocheck_owner_with_value(api, path, **kwargs):
         if not isslave:
             assert api.forcepermissive.option(path).owner.isdefault() is False
         else:
-            assert api.forcepermissive.option(path, 0).owner.isdefault() is False
+            assert api.forcepermissive.option(path, 0).owner.isdefault() is True
+            assert api.forcepermissive.option(path, 1).owner.isdefault() is False
     else:
         raises(PropertiesOptionError, "api.forcepermissive.option(path).owner.isdefault()")
 
@@ -773,18 +764,15 @@ def check_all(api, path, multi, **kwargs):
 
 
 def make_api(options, multi):
-    def make_option(path):
-        option_infos = path.split('_')
+    def make_option(path, option_infos):
+        #FIXME
         option_type = 'str'
         option_properties = []
-        for option_info in option_infos[1:]:
-            if option_info in OPTIONS_TYPE:
-                option_type = option_info
-            elif option_info in PROPERTIES:
-                option_properties.append(option_info)
-            else:
-                raise Exception('unknown {} in {}'.format(option_info, path))
-        args = [option_infos[0], "{}'s option".format(option_infos[0])]
+        if option_infos is not None:
+            for prop in PROPERTIES:
+                if option_infos.get(prop, False) is True:
+                    option_properties.append(prop)
+        args = [path, "{}'s option".format(path)]
         kwargs = {}
         if option_properties != []:
             kwargs['properties'] = tuple(option_properties)
@@ -794,28 +782,26 @@ def make_api(options, multi):
         return tiramisu_option(*args, **kwargs)
 
     def make_optiondescriptions(path, collected):
-        infos = path.split('_')
-        name = infos[0]
+        infos = collected.get('properties', {})
         properties = []
         kwargs = {}
         optiondescription = OptionDescription
-        for info in infos[1:]:
-            if info in PROPERTIES:
-                properties.append(info)
-            elif info == 'master':
-                if not multi:
-                    return
-                optiondescription = MasterSlaves
-            elif info == 'dyn':
-                optiondescription = DynOptionDescription
-                kwargs['callback'] = return_list
-            else:
-                raise Exception('unknown {} in {}'.format(info, path))
+
+        for prop in PROPERTIES:
+            if infos.get(prop, False) is True:
+                properties.append(prop)
+        if infos.get('master', False) is True:
+            if not multi:
+                return
+            optiondescription = MasterSlaves
+        if infos.get('dyn', False) is True:
+            optiondescription = DynOptionDescription
+            kwargs['callback'] = return_list
         options = []
         if 'options' in collected:
             options.extend(collected['options'])
         for key, values in collected.items():
-            if key == 'options':
+            if key in ['options', 'properties']:
                 continue
             option = make_optiondescriptions(key, values)
             if option is None:
@@ -823,19 +809,20 @@ def make_api(options, multi):
             options.append(option)
         if properties != []:
             kwargs['properties'] = tuple(properties)
-        return optiondescription(name, "{}'s optiondescription".format(name), options, **kwargs)
+        return optiondescription(path, "{}'s optiondescription".format(path), options, **kwargs)
             
     collect_options = {}
-    for option in options:
+    for path, option in options.items():
         if option is None:
             continue
         local_collect_options = collect_options
-        for optiondescription in option.split('.')[:-1]:
-            local_collect_options.setdefault(optiondescription, {})
+        for optiondescription in path.split('.')[:-1]:
+            local_collect_options.setdefault(optiondescription, {'properties': {}})
             local_collect_options = local_collect_options[optiondescription]
-        path = '.'.join(option.split('.')[:-1])
-        option_name = option.split('.')[-1]
-        local_collect_options.setdefault("options", []).append(make_option(option_name))
+            local_collect_options['properties'].update(option.get(optiondescription, {}))
+        option_name = path.split('.')[-1]
+        path = '.'.join(path.split('.')[:-1])
+        local_collect_options.setdefault('options', []).append(make_option(option_name, option.get(option_name)))
 
     rootod = make_optiondescriptions('root', collect_options)
     if rootod is None:
@@ -846,39 +833,45 @@ def make_api(options, multi):
 
 DICT_PATHS = [
     #test a config without optiondescription
-    OrderedDict([('first', 'first'),
-                 ('second', 'second_disabled'),
-                 ('third', 'third_hidden')]),
+    OrderedDict([('first', {}),
+                 ('second', {'second': {'disabled': True}}),
+                 ('third', {'third': {'hidden': True}})]),
     #test a config with an optiondescription
-    OrderedDict([('subod.first', 'subod.first'),
-                 ('subod.second', 'subod.second_disabled'),
-                 ('subod.third', 'subod.third_hidden')]),
+    OrderedDict([('subod.first', {}),
+                 ('subod.second', {'second': {'disabled': True}}),
+                 ('subod.third', {'third': {'hidden': True}})]),
     #test a config with two optiondescription
-    OrderedDict([('subod.subsubod.first', 'subod.subsubod.first'),
-                 ('subod.subsubod.second', 'subod.subsubod.second_disabled'),
-                 ('subod.subsubod.third', 'subod.subsubod.third_hidden')]),
+    OrderedDict([('subod.subsubod.first', {}),
+                 ('subod.subsubod.second', {'second': {'disabled': True}}),
+                 ('subod.subsubod.third', {'third': {'hidden': True}})]),
     #test a config with mix of different optiondescription
-    OrderedDict([('first', 'first'),
-                 ('subod.second', 'subod.second_disabled'),
-                 ('subod.subsubod.third', 'subod.subsubod.third_hidden')]),
+    OrderedDict([('first', {}),
+                 ('subod.second', {'second': {'disabled': True}}),
+                 ('subod.subsubod.third', {'third': {'hidden': True}})]),
     #test a config with masterslaves
-    OrderedDict([('first.first', 'first_master.first'),
-                 ('first.second', 'first_master.second_disabled'),
-                 ('first.third', 'first_master.third_hidden')]),
+    OrderedDict([('odmaster.first', {'odmaster': {'master': True}}),
+                 ('odmaster.second', {'second': {'disabled': True}}),
+                 ('odmaster.third', {'third': {'hidden': True}})]),
     ##test a config with dynoption
-    OrderedDict([('subodval1.firstval1', 'subod_dyn.first'),
-                 ('subodval1.secondval1', 'subod_dyn.second_disabled'),
-                 ('subodval1.thirdval1', 'subod_dyn.third_hidden'),
+    OrderedDict([('subod.first', {'subod': {'dyn': True}}),
+                 ('subod.second', {'second': {'disabled': True}}),
+                 ('subod.third', {'third': {'hidden': True}}),
+                 ('subodval1.firstval1', None),
+                 ('subodval1.secondval1', None),
+                 ('subodval1.thirdval1', None),
                  ('subodval2.firstval2', None),
                  ('subodval2.secondval2', None),
                  ('subodval2.thirdval2', None)]),
     #test a config with dynoption subdir
-    OrderedDict([('subod.subodval1.firstval1', 'subod.subod_dyn.first'),
-                 ('subod.subodval1.secondval1', 'subod.subod_dyn.second_disabled'),
-                 ('subod.subodval1.thirdval1', 'subod.subod_dyn.third_hidden'),
-                 ('subod.subodval2.firstval2', None),
-                 ('subod.subodval2.secondval2', None),
-                 ('subod.subodval2.thirdval2', None)])
+    OrderedDict([('subod.subsubod.first', {'subsubod': {'dyn': True}}),
+                 ('subod.subsubod.second', {'second': {'disabled': True}}),
+                 ('subod.subsubod.third', {'third': {'hidden': True}}),
+                 ('subod.subsubodval1.firstval1', None),
+                 ('subod.subsubodval1.secondval1', None),
+                 ('subod.subsubodval1.thirdval1', None),
+                 ('subod.subsubodval2.firstval2', None),
+                 ('subod.subsubodval2.secondval2', None),
+                 ('subod.subsubodval2.thirdval2', None)])
 ]
 
 
@@ -892,31 +885,35 @@ def paths(request):
 def test_options(paths):
     lpaths = list(paths.keys())
     for multi in (False, True):
-        api = make_api(paths.values(), multi)
+        api = make_api(paths, multi)
         if api is None:
             continue
-        check_all(api, lpaths[0], multi)
-        check_all(api, lpaths[1], multi, propertyerror=True, extra_properties=['disabled'])
-        check_all(api, lpaths[2], multi, permissive=True, extra_properties=['hidden'])
-        if len(lpaths) == 6:
+        if len(lpaths) == 9:
             check_all(api, lpaths[3], multi)
             check_all(api, lpaths[4], multi, propertyerror=True, extra_properties=['disabled'])
             check_all(api, lpaths[5], multi, permissive=True, extra_properties=['hidden'])
-    ##
-    #print('')
-    #print(api.help)
+            check_all(api, lpaths[6], multi)
+            check_all(api, lpaths[7], multi, propertyerror=True, extra_properties=['disabled'])
+            check_all(api, lpaths[8], multi, permissive=True, extra_properties=['hidden'])
+        else:
+            check_all(api, lpaths[0], multi)
+            check_all(api, lpaths[1], multi, propertyerror=True, extra_properties=['disabled'])
+            check_all(api, lpaths[2], multi, permissive=True, extra_properties=['hidden'])
 
 
 DICT_PATHS2 = [
-    OrderedDict([('subod.subsubod.first', 'subod.subsubod_hidden.first'),
-                 ('subod.subsubod.second', 'subod.subsubod_hidden.second'),
-                 ('subod.subsubod.third', 'subod.subsubod_hidden.third_hidden')]),
-    OrderedDict([('subod.subodval1.firstval1', 'subod.subod_dyn_hidden.first'),
-                 ('subod.subodval1.secondval1', 'subod.subod_dyn_hidden.second'),
-                 ('subod.subodval1.thirdval1', 'subod.subod_dyn_hidden.third_hidden'),
-                 ('subod.subodval2.firstval2', None),
-                 ('subod.subodval2.secondval2', None),
-                 ('subod.subodval2.thirdval2', None)])
+    OrderedDict([('subod.subsubod.first', {'subsubod': {'hidden': True}}),
+                 ('subod.subsubod.second', {}),
+                 ('subod.subsubod.third', {})]),
+    OrderedDict([('subod.subsubod.first', {'subsubod': {'dyn': True, 'hidden': True}}),
+                 ('subod.subsubod.second', {}),
+                 ('subod.subsubod.third', {}),
+                 ('subod.subsubodval1.firstval1', None),
+                 ('subod.subsubodval1.secondval1', None),
+                 ('subod.subsubodval1.thirdval1', None),
+                 ('subod.subsubodval2.firstval2', None),
+                 ('subod.subsubodval2.secondval2', None),
+                 ('subod.subsubodval2.thirdval2', None)])
 ]
 
 
@@ -932,13 +929,17 @@ def test_tree_od_permissive(paths2):
     """
     lpaths = list(paths2.keys())
     for multi in (False, True):
-        api = make_api(paths2.values(), multi)
+        api = make_api(paths2, multi)
         if api is None:
             continue
-        check_all(api, lpaths[0], multi, permissive=True)
-        check_all(api, lpaths[1], multi, permissive=True)
-        check_all(api, lpaths[2], multi, permissive=True, extra_properties=['hidden'])
-        if len(lpaths) == 6:
+        if len(lpaths) == 9:
             check_all(api, lpaths[3], multi, permissive=True)
             check_all(api, lpaths[4], multi, permissive=True)
-            check_all(api, lpaths[5], multi, permissive=True, extra_properties=['hidden'])
+            check_all(api, lpaths[5], multi, permissive=True)
+            check_all(api, lpaths[6], multi, permissive=True)
+            check_all(api, lpaths[7], multi, permissive=True)
+            check_all(api, lpaths[8], multi, permissive=True)
+        else:
+            check_all(api, lpaths[0], multi, permissive=True)
+            check_all(api, lpaths[1], multi, permissive=True)
+            check_all(api, lpaths[2], multi, permissive=True)
diff --git a/test/test_parsing_group.py b/test/test_parsing_group.py
index 1ae909a..6ba0826 100644
--- a/test/test_parsing_group.py
+++ b/test/test_parsing_group.py
@@ -285,12 +285,6 @@ def test_values_with_master_remove():
     assert cfg.ip_admin_eth0.netmask_admin_eth0 == ['255.255.255.128']
 
 
-def test_master_not_valid_name():
-    ip_admin_eth0 = StrOption('ip_admin_eth0', "ip réseau autorisé", multi=True)
-    netmask_admin_eth0 = StrOption('netmask_admin_eth0', "masque du sous-réseau", multi=True)
-    raises(ValueError, "MasterSlaves('interface1', '', [ip_admin_eth0, netmask_admin_eth0])")
-
-
 def test_sub_group_in_master_group():
     ip_admin_eth0 = StrOption('ip_admin_eth0', "ip réseau autorisé", multi=True)
     netmask_admin_eth0 = StrOption('netmask_admin_eth0', "masque du sous-réseau", multi=True)
diff --git a/tiramisu/api.py b/tiramisu/api.py
index c3e31c6..1781eb9 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -35,6 +35,7 @@ class CommonTiramisu(object):
                  path,
                  index,
                  config,
+                 setting_properties,
                  force_permissive,
                  force_unrestraint):
         self.opt = opt
@@ -43,6 +44,7 @@ class CommonTiramisu(object):
         if self.slave_need_index:
             self._test_slave_index()
         self.config = config
+        self.setting_properties = setting_properties
         self.force_permissive = force_permissive
         self.force_unrestraint = force_unrestraint
         if not self.allow_unrestraint:
@@ -81,11 +83,19 @@ class TiramisuOptionOption(CommonTiramisu):
     allow_unrestraint = True
     slave_need_index = False
 
-    def __init__(self, opt, path, index, config, force_permissive, force_unrestraint):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
         super(TiramisuOptionOption, self).__init__(opt,
                                                    path,
                                                    index,
                                                    config,
+                                                   setting_properties,
                                                    force_permissive,
                                                    force_unrestraint)
         if config:
@@ -117,11 +127,19 @@ class TiramisuOptionOption(CommonTiramisu):
 class TiramisuOptionOwner(CommonTiramisu):
     """manager option's owner"""
 
-    def __init__(self, opt, path, index, config, force_permissive, force_unrestraint):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
         super(TiramisuOptionOwner, self).__init__(opt,
                                                   path,
                                                   index,
                                                   config,
+                                                  setting_properties,
                                                   force_permissive,
                                                   force_unrestraint)
         if config:
@@ -135,9 +153,8 @@ class TiramisuOptionOwner(CommonTiramisu):
 
     def isdefault(self):
         """is option has defaut value"""
-        #FIXME isdefault for slave should have index!
-        #FIXME should not be here, just for check property
         return self.values.is_default_owner(self.opt,
+                                            index=self.index,
                                             force_permissive=self.force_permissive)
 
     def set(self, owner):
@@ -158,11 +175,19 @@ class TiramisuOptionProperty(CommonTiramisu):
     #allow_unrestraint = True
     slave_need_index = False
 
-    def __init__(self, opt, path, index, config, force_permissive, force_unrestraint):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
         super(TiramisuOptionProperty, self).__init__(opt,
                                                      path,
                                                      index,
                                                      config,
+                                                     setting_properties,
                                                      force_permissive,
                                                      force_unrestraint)
         if config:
@@ -170,7 +195,10 @@ class TiramisuOptionProperty(CommonTiramisu):
 
     def get(self):
         self._test_slave_index()
-        return self.settings.getproperties(self.opt, self.path, index=self.index, obj=False)
+        return self.settings.getproperties(self.opt,
+                                           self.path,
+                                           index=self.index,
+                                           obj=False)
 
     def set(self, properties):
         """set properties for a specified option"""
@@ -189,11 +217,19 @@ class TiramisuOptionPermissive(CommonTiramisu):
     allow_unrestraint = True
     slave_need_index = False
 
-    def __init__(self, opt, path, index, config, force_permissive, force_unrestraint):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
         super(TiramisuOptionPermissive, self).__init__(opt,
                                                        path,
                                                        index,
                                                        config,
+                                                       setting_properties,
                                                        force_permissive,
                                                        force_unrestraint)
         if config:
@@ -201,8 +237,7 @@ class TiramisuOptionPermissive(CommonTiramisu):
 
     def get(self):
         """get permissive value for a specified path"""
-        setting_properties = self.settings.getproperties(None, None, obj=False)
-        return self.settings.getpermissive(setting_properties, self.path)
+        return self.settings.getpermissive(self.setting_properties, self.path)
 
     def set(self, permissive):
         self.settings.setpermissive(permissive, opt=self.opt, path=self.path)
@@ -217,25 +252,28 @@ class TiramisuOptionPermissive(CommonTiramisu):
 class TiramisuOptionValue(CommonTiramisu):
     """manager option's value"""
 
-    def __init__(self, opt, path, index, config, force_permissive, force_unrestraint):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
+
         super(TiramisuOptionValue, self).__init__(opt,
                                                   path,
                                                   index,
                                                   config,
+                                                  setting_properties,
                                                   force_permissive,
                                                   force_unrestraint)
 
-    def append(self, value=undefined):
-        if not self.opt.impl_is_master_slaves('master'):
-            raise APIError('append is only allowed for a master')
-        multi = self.config.getattr(self.path,
-                                    force_permissive=self.force_permissive)
-        multi.append(value)
-        self.set(multi)
-
     def get(self):
+        settings = self.config.cfgimpl_get_settings()
         value = self.config.getattr(self.path,
                                     index=self.index,
+                                    setting_properties=self.setting_properties,
                                     force_permissive=self.force_permissive)
         if isinstance(value, Multi):
             value = list(value)
@@ -247,45 +285,53 @@ class TiramisuOptionValue(CommonTiramisu):
         if isinstance(value, list):
             while undefined in value:
                 idx = value.index(undefined)
-                value[idx] = values._getdefaultvalue(self.opt,
-                                                     self.path,
-                                                     True,
-                                                     idx,
-                                                     undefined,
-                                                     True)
+                value[idx] = values.getdefaultvalue(self.opt,
+                                                    self.path,
+                                                    idx)
         else:
             if value == undefined:
-                value = values._getdefaultvalue(self.opt,
-                                                self.path,
-                                                True,
-                                                self.index,
-                                                undefined,
-                                                True)
+                value = values.getdefaultvalue(self.opt,
+                                               self.path,
+                                               self.index)
         self.config.setattr(self.path,
                             value,
                             index=self.index,
                             force_permissive=self.force_permissive)
 
+    def pop(self, index):
+        """pop value for a specified master values
+        """
+        self.config.delattr(self.path,
+                            index=index,
+                            setting_properties=self.setting_properties,
+                            force_permissive=self.force_permissive)
+
     def reset(self):
         """reset value for a value"""
-        if self.index is None:
-            self.config.cfgimpl_get_values().reset(self.opt,
-                                                   path=self.path,
-                                                   force_permissive=self.force_permissive)
-        else:
-            #FIXME ... _p_ ...
-            self.config.cfgimpl_get_values()._p_.resetvalue_index(self.path, self.index)
+        self.config.delattr(self.path,
+                            index=self.index,
+                            setting_properties=self.setting_properties,
+                            force_permissive=self.force_permissive)
 
 
 class TiramisuOption(object):
     icon = '\u2937'
     tmpl_help = ' {} {}: {}'
 
-    def __init__(self, opt, path, index, config, force_permissive=False, force_unrestraint=False):
+    def __init__(self,
+                 opt,
+                 path,
+                 index,
+                 config,
+                 setting_properties,
+                 force_permissive,
+                 force_unrestraint):
+
         self.opt = opt
         self.path = path
         self.index = index
         self.config = config
+        self.setting_properties = setting_properties
         self.force_permissive = force_permissive
         self.force_unrestraint = force_unrestraint
         self.registers = {}
@@ -310,6 +356,7 @@ class TiramisuOption(object):
                                            self.path,
                                            self.index,
                                            self.config,
+                                           self.setting_properties,
                                            self.force_permissive,
                                            self.force_unrestraint)
         elif subfunc == 'help':
@@ -322,18 +369,25 @@ class TiramisuAPI(object):
     icon = '\u2937'
     tmpl_help = ' {} {}: {}'
 
-    def __init__(self, config, force_permissive=False, force_unrestraint=False):
+    def __init__(self,
+                 config,
+                 force_permissive=False,
+                 force_unrestraint=False):
         self.config = config
         self.force_permissive = force_permissive
         self.force_unrestraint = force_unrestraint
+        settings = self.config.cfgimpl_get_settings()
         #FIXME ?
         self.config.read_write()
-        self.config.cfgimpl_get_settings().setpermissive(('hidden',))
+        settings.setpermissive(('hidden',))
         #/FIXME ?
 
     def option(self, path, index=None):
         validate = not self.force_unrestraint
+        settings = self.config.cfgimpl_get_settings()
+        setting_properties = settings.get_global_properties()
         opt = self.config.unwrap_from_path(path,
+                                           setting_properties=setting_properties,
                                            validate=validate,
                                            validate_properties=validate,
                                            force_permissive=self.force_permissive,
@@ -344,14 +398,19 @@ class TiramisuAPI(object):
                               path,
                               index,
                               self.config,
-                              force_permissive=self.force_permissive,
-                              force_unrestraint=self.force_unrestraint)
+                              setting_properties,
+                              self.force_permissive,
+                              self.force_unrestraint)
 
     def __getattr__(self, subfunc):
         if subfunc == 'forcepermissive':
-            return TiramisuAPI(self.config, force_permissive=True, force_unrestraint=self.force_unrestraint)
+            return TiramisuAPI(self.config,
+                               force_permissive=True,
+                               force_unrestraint=self.force_unrestraint)
         elif subfunc == 'unrestraint':
-            return TiramisuAPI(self.config, force_permissive=self.force_permissive, force_unrestraint=True)
+            return TiramisuAPI(self.config,
+                               force_permissive=self.force_permissive,
+                               force_unrestraint=True)
         elif subfunc == 'help':
             return self._help()
         else:
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 19dda72..9ff65eb 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -146,6 +146,7 @@ class SubConfig(object):
 
     def cfgimpl_get_home_by_path(self, path, force_permissive=False,
                                  returns_raise=False, _setting_properties=undefined,
+                                 setting_properties=undefined,
                                  validate_properties=True):
         """:returns: tuple (config, name)"""
         path = path.split('.')
@@ -154,6 +155,7 @@ class SubConfig(object):
                                 force_permissive=force_permissive,
                                 returns_raise=returns_raise,
                                 validate_properties=validate_properties,
+                                setting_properties=setting_properties,
                                 _setting_properties=_setting_properties)
             if isinstance(self, Exception):
                 return self, None
@@ -314,9 +316,59 @@ class SubConfig(object):
                 return ret
 
     def __delattr__(self, name):
+        self.delattr(name)
+
+    def delattr(self,
+                name,
+                index=None,
+                force_permissive=False,
+                setting_properties=undefined,
+                validate=True,
+                not_raises=False):
         context = self._cfgimpl_get_context()
-        child = self.cfgimpl_get_description().__getattr__(name, context)
-        self.cfgimpl_get_values().__delitem__(child)
+        if setting_properties is undefined:
+            setting_properties = context.cfgimpl_get_settings()._getproperties(read_write=True)
+        if '.' in name:  # pragma: optional cover
+            self, name = self.cfgimpl_get_home_by_path(name,
+                                                       force_permissive=force_permissive,
+                                                       setting_properties=setting_properties)
+        child = self.cfgimpl_get_description().__getattr__(name,
+                                                           context=context)
+        if isinstance(child, (OptionDescription, SynDynOptionDescription)):
+            raise TypeError(_("can't delete an OptionDescription"))  # pragma: optional cover
+        elif child._is_symlinkoption() and \
+                not isinstance(child, DynSymLinkOption):  # pragma: no dynoptiondescription cover
+            raise TypeError(_("can't delete a SymlinkOption"))
+        else:
+            subpath = self._get_subpath(name)
+            values = self.cfgimpl_get_values()
+            if index is not None:
+                if child.impl_is_master_slaves('master'):
+                    ret = values.reset_master(self,
+                                              child,
+                                              subpath,
+                                              index,
+                                              force_permissive,
+                                              setting_properties)
+                elif child.impl_is_master_slaves('slave'):
+                    ret = values.reset_slave(child,
+                                             subpath,
+                                             index,
+                                             setting_properties,
+                                             force_permissive=force_permissive,
+                                             validate=validate)
+                else:
+                    raise ValueError(_("can delete value with index only with a master or a slave"))
+            else:
+                ret = values.reset(child,
+                                   subpath,
+                                   _setting_properties=setting_properties,
+                                   force_permissive=force_permissive,
+                                   validate=validate)
+            if ret:
+                if not_raises:
+                    return ret
+                raise ret
 
     def __getattr__(self, name):
         return self.getattr(name)
@@ -333,7 +385,7 @@ class SubConfig(object):
             subpath = self._impl_path + '.' + name
         return subpath
 
-    def getattr(self, name, force_permissive=False, validate=True,
+    def getattr(self, name, force_permissive=False, validate=True, setting_properties=undefined,
                 _setting_properties=undefined, _self_properties=undefined, index=None,
                 returns_raise=False, returns_option=False,
                 validate_properties=True):
@@ -347,7 +399,10 @@ class SubConfig(object):
         # for instance getattr(self, "creole.general.family.adresse_ip_eth0")
         context = self._cfgimpl_get_context()
         if _setting_properties is undefined:
-            _setting_properties = context.cfgimpl_get_settings()._getproperties(read_write=True)
+            if setting_properties is not undefined:
+                _setting_properties = setting_properties
+            else:
+                _setting_properties = context.cfgimpl_get_settings()._getproperties(read_write=True)
         if '.' in name:
             homeconfig, name = self.cfgimpl_get_home_by_path(
                 name, force_permissive=force_permissive,
@@ -691,27 +746,30 @@ class _CommonConfig(SubConfig):
 
     def unwrap_from_path(self, path, force_permissive=False, index=None,
                          validate_properties=True, validate=True,
-                         _setting_properties=undefined):
+                         _setting_properties=undefined, setting_properties=undefined):
         """convenience method to extract and Option() object from the Config()
         and it is **fast**: finds the option directly in the appropriate
         namespace
 
         :returns: Option()
         """
-        if _setting_properties is undefined:
-            context = self._cfgimpl_get_context()
-            _setting_properties = context.cfgimpl_get_settings()._getproperties(read_write=True)
+        if setting_properties is undefined:
+            if _setting_properties is not undefined:
+                setting_properties = _setting_properties
+            else:
+                context = self._cfgimpl_get_context()
+                setting_properties = context.cfgimpl_get_settings()._getproperties(read_write=True)
         if '.' in path:
             self, path = self.cfgimpl_get_home_by_path(path,
                                                        validate_properties=validate_properties,
                                                        force_permissive=force_permissive,
-                                                       _setting_properties=_setting_properties)
+                                                       _setting_properties=setting_properties)
         return self.getattr(path,
                             validate_properties=validate_properties,
                             validate=validate,
                             force_permissive=force_permissive,
                             index=index,
-                            _setting_properties=_setting_properties,
+                            _setting_properties=setting_properties,
                             returns_option=True)
 
     def cfgimpl_get_path(self, dyn=True):
@@ -928,6 +986,7 @@ class GroupConfig(_CommonConfig):
 
     def getattr(self, name, force_permissive=False, validate=True,
                 _setting_properties=undefined, _self_properties=undefined, index=None,
+                setting_properties=undefined,
                 returns_raise=False, returns_option=False,
                 validate_properties=True):
         for child in self._impl_children:
@@ -938,6 +997,7 @@ class GroupConfig(_CommonConfig):
                                                 _self_properties=_self_properties,
                                                 index=index,
                                                 _setting_properties=_setting_properties,
+                                                setting_properties=setting_properties,
                                                 returns_raise=returns_raise,
                                                 returns_option=False,
                                                 validate_properties=validate_properties)
diff --git a/tiramisu/option/optiondescription.py b/tiramisu/option/optiondescription.py
index 1aede43..56e9de2 100644
--- a/tiramisu/option/optiondescription.py
+++ b/tiramisu/option/optiondescription.py
@@ -572,10 +572,6 @@ class MasterSlaves(OptionDescription):
         self._group_type = groups.master
         slaves = []
         master = children[0]
-        if master.impl_getname() != name:
-            raise ValueError(_('master group with wrong'
-                               ' master name for {0}'
-                              ).format(name))
         for child in children[1:]:
             if child.impl_getdefault() != []:
                 raise ValueError(_("not allowed default value for option {0} "
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index fdab002..fa2a11a 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -377,6 +377,9 @@ class Settings(object):
             self._p_.delproperties(_path)
         self._getcontext().cfgimpl_reset_cache(opt=opt, path=_path, only=('settings', 'values'))
 
+    def get_global_properties(self):
+        return self._getproperties()
+
     def _getproperties(self, opt=None, path=None,
                        setting_properties=undefined, read_write=True,
                        apply_requires=True, index=None):
diff --git a/tiramisu/storage/util.py b/tiramisu/storage/util.py
index 59a941c..5cf1fc7 100644
--- a/tiramisu/storage/util.py
+++ b/tiramisu/storage/util.py
@@ -15,6 +15,12 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 # ____________________________________________________________
+FIXME = 0
+def POUET(obj):
+    return(obj.__class__.__name__.lower())
+
+DEBUG = False
+#DEBUG = True
 
 
 class Cache(object):
@@ -29,17 +35,41 @@ class Cache(object):
         """add val in cache for a specified path
         if slave, add index
         """
+        if DEBUG:
+            global FIXME
+            FIXME += 1
+            print('ca set cache', path, val, POUET(self), FIXME)
+            #if path is not None and (path.startswith('od.st.') or path.startswith('od.dod.')):
+            #    raise Exception('mais ... mais ... mais')
+            #if FIXME == 111:
+            #    raise Exception('rah')
         self._cache.setdefault(path, {})[index] = (val, time)
 
     def getcache(self, path, exp, index):
         value, created = self._cache[path][index]
         if created is None or exp <= created:
+            if DEBUG:
+                global FIXME
+                FIXME += 1
+                print('ca trouve dans le cache', path, value, POUET(self), FIXME)
+                #if path is not None and (path.startswith('od.st.') or path.startswith('od.dod.')):
+                #    raise Exception('mais ... mais ... mais')
+                #if FIXME == 45:
+                #    raise Exception('rah')
             return True, value
         return False, None  # pragma: no cover
 
     def delcache(self, path):
         """remove cache for a specified path
         """
+        if DEBUG:
+            global FIXME
+            FIXME += 1
+            print('ca del cache', path, POUET(self), FIXME)
+            #if path is not None and (path.startswith('od.st.') or path.startswith('od.dod.')):
+            #    raise Exception('mais ... mais ... mais')
+            #if FIXME == 23:
+            #    raise Exception('rah')
         if path in  self._cache:
             del self._cache[path]
 
@@ -48,6 +78,8 @@ class Cache(object):
 
         :param path: the path's option
         """
+        if DEBUG:
+            print('ca cherche dans le cache', path, POUET(self))
         return path in self._cache and index in self._cache[path]
 
     def reset_expired_cache(self, exp):
@@ -63,6 +95,8 @@ class Cache(object):
 
     def reset_all_cache(self):
         "empty the cache"
+        if DEBUG:
+            print('bzzzzzzzzzzzz delete tout le cache', POUET(self))
         self._cache.clear()
 
     def get_cached(self):
diff --git a/tiramisu/value.py b/tiramisu/value.py
index efdbed9..ad3067b 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -211,6 +211,63 @@ class Values(object):
                 self._p_.resetvalue(path, session, _commit)
             context.cfgimpl_reset_cache(opt=opt, path=path, only=('values', 'properties'))
 
+    def reset_slave(self,
+                    opt,
+                    path,
+                    index,
+                    setting_properties,
+                    validate=True,
+                    force_permissive=False):
+
+        context = self._getcontext()
+        if validate and 'validator' in setting_properties:
+            session = context.cfgimpl_get_values()._p_.getsession()
+            fake_context = context._gen_fake_values(session)
+            fake_value = fake_context.cfgimpl_get_values()
+            fake_value.reset_slave(opt,
+                                   path,
+                                   index,
+                                   setting_properties,
+                                   validate=False)
+            ret = fake_value._get_cached_value(opt,
+                                               path,
+                                               index=index,
+                                               setting_properties=setting_properties,
+                                               check_frozen=True,
+                                               force_permissive=force_permissive)
+            if isinstance(ret, Exception):
+                raise ret
+        self._p_.resetvalue_index(path, index)
+
+    def reset_master(self,
+                     subconfig,
+                     opt,
+                     path,
+                     index,
+                     force_permissive,
+                     setting_properties):
+
+        current_value = self._get_cached_value(opt,
+                                               path,
+                                               setting_properties=setting_properties,
+                                               check_frozen=True,
+                                               force_permissive=force_permissive)
+        current_value.pop(index)
+        ret = self.setitem(opt,
+                           current_value,
+                           path,
+                           force_permissive=force_permissive,
+                           not_raises=True,
+                           index=None,
+                           setting_properties=setting_properties,
+                           _commit=True)
+        if ret:
+            return ret
+        subconfig.cfgimpl_get_description().pop(opt,
+                                                path,
+                                                self,
+                                                index)
+
     def _isempty(self, opt, value, force_allow_empty_list=False, index=None):
         "convenience method to know if an option is empty"
         if value is undefined: