diff --git a/test/test_config_api.py b/test/test_config_api.py
index 2f01c3f..014e6ab 100644
--- a/test/test_config_api.py
+++ b/test/test_config_api.py
@@ -116,8 +116,26 @@ def test_make_dict_with_disabled():
     config = Config(descr)
     api = getapi(config)
     api.property.read_only()
-    d = api.option.make_dict()
-    assert d == {"s1.a": False, "int": 42}
+    assert api.option.make_dict() == {"s1.a": False, "int": 42}
+    assert api.forcepermissive.option.make_dict() == {"s1.a": False, "int": 42}
+    assert api.unrestraint.option.make_dict() == {"int": 42, "s1.a": False, "s1.b": False, "s2.a": False, "s2.b": False}
+
+
+def test_make_dict_with_disabled_withoption():
+    descr = OptionDescription("opt", "", [
+        OptionDescription("s1", "", [
+            BoolOption("a", "", default=False),
+            BoolOption("b", "", default=False, properties=('disabled',))]),
+        OptionDescription("s2", "", [
+            BoolOption("a", "", default=False),
+            BoolOption("b", "", default=False)], properties=('disabled',)),
+        IntOption("int", "", default=42)])
+    config = Config(descr)
+    api = getapi(config)
+    api.property.read_only()
+    assert api.option.make_dict(withoption="a") == {"s1.a": False}
+    assert api.forcepermissive.option.make_dict(withoption="a") == {"s1.a": False}
+    assert api.unrestraint.option.make_dict(withoption="a") == {"s1.a": False, "s1.b": False, "s2.a": False, "s2.b": False}
 
 
 def test_make_dict_with_disabled_in_callback():
diff --git a/test/test_masterslaves.py b/test/test_masterslaves.py
index f406454..19a7023 100644
--- a/test/test_masterslaves.py
+++ b/test/test_masterslaves.py
@@ -163,6 +163,26 @@ def test_groups_with_master():
     assert interface1.impl_get_group_type() == groups.master
 
 
+def test_groups_is_master():
+    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, default_multi='value')
+    interface1 = MasterSlaves('ip_admin_eth0', '', [ip_admin_eth0, netmask_admin_eth0])
+    var = StrOption('var', "ip réseau autorisé", multi=True)
+    od2 = OptionDescription('od2', '', [var])
+    od1 = OptionDescription('od', '', [interface1, od2])
+    api = getapi(Config(od1))
+    assert not api.option('od2').option.ismasterslaves()
+    assert api.option('ip_admin_eth0').option.ismasterslaves()
+    assert not api.option('od2.var').option.ismaster()
+    assert not api.option('od2.var').option.isslave()
+    assert api.option('ip_admin_eth0.ip_admin_eth0').option.ismaster()
+    assert not api.option('ip_admin_eth0.ip_admin_eth0').option.isslave()
+    assert not api.option('ip_admin_eth0.netmask_admin_eth0').option.ismaster()
+    assert api.option('ip_admin_eth0.netmask_admin_eth0').option.isslave()
+    assert api.option('ip_admin_eth0.netmask_admin_eth0').option.path() == 'ip_admin_eth0.netmask_admin_eth0'
+    assert api.option('ip_admin_eth0.netmask_admin_eth0').option.defaultmulti() == 'value'
+
+
 if TIRAMISU_VERSION != 2:
     def test_groups_with_master_in_root():
         ip_admin_eth0 = StrOption('ip_admin_eth0', "ip réseau autorisé", multi=True)
diff --git a/test/test_metaconfig.py b/test/test_metaconfig.py
index c3da53e..8ca900d 100644
--- a/test/test_metaconfig.py
+++ b/test/test_metaconfig.py
@@ -235,6 +235,7 @@ def test_not_meta():
     raises(ValueError, "GroupConfig(conf1)")
     #same name
     raises(ConflictError, "GroupConfig([conf2, conf4], session_id='conf2')")
+    raises(ConflictError, "GroupConfig([conf2, conf2], session_id='conf8')")
     grp = GroupConfig([conf1, conf2])
     api = getapi(grp)
     raises(ConfigError, "api.option('od1.i1').value.get()")
diff --git a/test/test_requires.py b/test/test_requires.py
index fc69aae..c563e7a 100644
--- a/test/test_requires.py
+++ b/test/test_requires.py
@@ -126,6 +126,8 @@ def test_requires_same_action():
         props = err.proptype
         submsg = '"disabled" (' + _('the value of "{0}" is {1}').format('activate_service', '"False"') + ')'
         assert str(err) == str(_('cannot access to {0} "{1}" because has {2} {3}').format('option', 'ip_address_service_web', 'property', submsg))
+        #access to cache
+        assert str(err) == str(_('cannot access to {0} "{1}" because has {2} {3}').format('option', 'ip_address_service_web', 'property', submsg))
     assert frozenset(props) == frozenset(['disabled'])
 
 
diff --git a/test/test_symlink.py b/test/test_symlink.py
index 2f83351..cdc62d3 100644
--- a/test/test_symlink.py
+++ b/test/test_symlink.py
@@ -53,6 +53,26 @@ def test_symlink_del_option():
     raises(TypeError, "api.option('c').value.reset()")
 
 
+def test_symlink_addproperties():
+    boolopt = BoolOption('b', '', default=True, properties=('test',))
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription('opt', '', [boolopt, linkopt])
+    api = getapi(Config(descr))
+    api.property.read_write()
+    raises(TypeError, "api.option('c').property.add('new')")
+    raises(TypeError, "api.option('c').property.reset()")
+
+
+def test_symlink_addpermissive():
+    boolopt = BoolOption('b', '', default=True, properties=('test',))
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription('opt', '', [boolopt, linkopt])
+    api = getapi(Config(descr))
+    api.property.read_write()
+    raises(TypeError, "api.option('c').permissive.set(frozenset(['new']))")
+    raises(TypeError, "api.option('c').permissive.reset()")
+
+
 def test_symlink_getproperties():
     boolopt = BoolOption('b', '', default=True, properties=('test',))
     linkopt = SymLinkOption("c", boolopt)
diff --git a/tiramisu/api.py b/tiramisu/api.py
index 932aae4..252ba17 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -43,7 +43,7 @@ def count(func):
     global MOD_COUNT_TIME
     class_name = func.__str__().split()[1].split('.')[0]
     func_name = func.__name__
-    def wrapper(*args, **kwargs):
+    def wrapper(*args, **kwargs):  # pragma: no cover
         time1 = time()
         ret = func(*args, **kwargs)
         time2 = time()
@@ -55,7 +55,7 @@ def count(func):
         #print('%s function took %0.3f ms' % (func_name, diff))
         #print(COUNT_TIME)
         return ret
-    if COUNT_TIME is not False:
+    if COUNT_TIME is not False:  # pragma: no cover
         COUNT_TIME.setdefault(class_name, {})
         COUNT_TIME[class_name][func_name] = {'max': 0,
                                              'min': 1000,
@@ -67,7 +67,7 @@ def count(func):
 
 
 def display_count():
-    if COUNT_TIME is not False:
+    if COUNT_TIME is not False:  # pragma: no cover
         global MOD_COUNT_TIME
         #print(MOD_COUNT_TIME)
         print()
@@ -104,7 +104,7 @@ class TiramisuHelp:
             module = self.registers[module_name]
             instance_module = module(None)
             if isinstance(instance_module, TiramisuDispatcher):
-                if _valid and not getdoc(module.__call__):
+                if _valid and not getdoc(module.__call__):  # pragma: no cover
                     raise Exception('unknown doc for {}'.format('__call__'))
                 module_doc = _(getdoc(module.__call__))
                 module_signature = signature(module.__call__)
@@ -117,12 +117,12 @@ class TiramisuHelp:
                 else:
                     root = root + '[config(path).]'
             if isinstance(instance_module, CommonTiramisuOption):
-                if _valid and not getdoc(module):
+                if _valid and not getdoc(module):  # pragma: no cover
                     raise Exception('unknown doc for {}'.format(module.__class__.__name__))
                 module_doc = _(getdoc(module))
                 options.append(self.tmpl_help.format(space, self.icon, root + module_name, module_doc))
             if isinstance(instance_module, TiramisuContext):
-                if _valid and not getdoc(module):
+                if _valid and not getdoc(module):  # pragma: no cover
                     raise Exception('unknown doc for {}'.format(module.__class__.__name__))
                 module_doc = _(getdoc(module))
                 options.append(self.tmpl_help.format(space, self.icon, root + module_name, module_doc))
@@ -140,11 +140,11 @@ class TiramisuHelp:
                     module_args = '(' + ', '.join(module_args) + ')'
                     if func_name.startswith('_'):
                         func_name = func_name[1:]
-                    if _valid and not getdoc(func):
+                    if _valid and not getdoc(func):  # pragma: no cover
                         raise Exception('unknown doc for {}'.format(func.__name__))
                     options.append(self.tmpl_help.format(space, self.icon, root + func_name + module_args, _(getdoc(func))))
         if init:
-            if _display:
+            if _display:  # pragma: no cover
                 print('\n'.join(options))
         else:
             return options
@@ -487,9 +487,9 @@ class TiramisuOptionPermissive(CommonTiramisuOption):
                                         permissives=permissives)
 
     @count
-    def reset(self, path):
+    def reset(self):
         """reset all personalised permissive"""
-        self.set(tuple())
+        self.set(frozenset())
 
 
 class TiramisuOptionInformation(CommonTiramisuOption):
diff --git a/tiramisu/config.py b/tiramisu/config.py
index e92c9cb..103b00e 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -493,6 +493,7 @@ class SubConfig(object):
                                "option"))
         context = self.cfgimpl_get_context()
         if withoption is not None:
+            mypath = self.cfgimpl_get_path()
             for path in context.find(bytype=None,
                                      byname=withoption,
                                      byvalue=withvalue,
@@ -503,7 +504,6 @@ class SubConfig(object):
                                                config_bag)
                 sconfig_bag = config_bag.copy('nooption')
                 sconfig_bag.option = opt
-                mypath = self.cfgimpl_get_path()
                 if mypath is not None:
                     if mypath == path:
                         withoption = None
@@ -511,9 +511,9 @@ class SubConfig(object):
                         break
                     else:
                         tmypath = mypath + '.'
-                        if not path.startswith(tmypath):
-                            raise AttributeError(_('unexpected path {0}, '
-                                                   'should start with {1}'
+                        if not path.startswith(tmypath):  # pragma: no cover
+                            raise AttributeError(_('unexpected path "{0}", '
+                                                   'should start with "{1}"'
                                                    '').format(path, mypath))
                         path = path[len(tmypath):]
                 self._make_sub_dict(path,
@@ -578,12 +578,6 @@ class SubConfig(object):
                 if flatten:
                     name = option.impl_getname()
                 elif fullpath:
-                    #FIXME
-                    #root_path = self.cfgimpl_get_path()
-                    #if root_path is None:
-                    #    name = opt.impl_getname()
-                    #else:
-                    #    name = '.'.join([root_path, opt.impl_getname()])
                     name = self._get_subpath(name)
                 else:
                     name = '.'.join(_currpath + [name])
@@ -602,8 +596,7 @@ class _CommonConfig(SubConfig):
     "abstract base class for the Config, GroupConfig and the MetaConfig"
     __slots__ = ('_impl_values',
                  '_impl_settings',
-                 '_impl_meta',
-                 '_impl_test')
+                 '_impl_meta')
 
     def _impl_build_all_caches(self):
         descr = self.cfgimpl_get_description()
@@ -699,7 +692,7 @@ class _CommonConfig(SubConfig):
 # ____________________________________________________________
 class Config(_CommonConfig):
     "main configuration management entry"
-    __slots__ = ('__weakref__', '_impl_test', '_impl_name')
+    __slots__ = ('__weakref__', '_impl_name')
 
     def __init__(self,
                  descr,
@@ -748,7 +741,6 @@ class Config(_CommonConfig):
                                      ConfigBag(self),
                                      None)
         #undocumented option used only in test script
-        self._impl_test = False
         if _duplicate is False and (force_settings is None or force_values is None):
             self._impl_build_all_caches()
         self._impl_name = session_id
@@ -784,7 +776,7 @@ class GroupConfig(_CommonConfig):
                 name = names.pop(0)
                 if name in names:
                     raise ConflictError(_('config name must be uniq in '
-                                          'groupconfig for {0}').format(name))
+                                          'groupconfig for "{0}"').format(name))
         self._impl_children = children
         properties, permissives, values, session_id = get_storages(self,
                                                                    session_id,
@@ -799,7 +791,6 @@ class GroupConfig(_CommonConfig):
                                           ConfigBag(self),
                                           None)
         #undocumented option used only in test script
-        self._impl_test = False
         self._impl_name = session_id
 
     def cfgimpl_get_children(self):
diff --git a/tiramisu/error.py b/tiramisu/error.py
index 02637d6..b62f29f 100644
--- a/tiramisu/error.py
+++ b/tiramisu/error.py
@@ -23,9 +23,7 @@ def display_list(lst, separator='and', add_quote=False):
         separator = _('and')
     elif separator == 'or':
         separator = _('or')
-    if len(lst) == 0:
-        return ''
-    elif len(lst) == 1:
+    if len(lst) == 1:
         ret = lst[0]
         if not isinstance(ret, str):
             ret = str(ret)
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index 09e48cc..061fc09 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -306,7 +306,7 @@ class Settings(object):
         old `SubConfig`, `Values`, `Multi` or `Settings`)
         """
         context = self.context()
-        if context is None:  # pragma: optional cover
+        if context is None:  # pragma: no cover
             raise ConfigError(_('the context does not exist anymore'))
         return context
 
@@ -576,22 +576,15 @@ class Settings(object):
         if path is not None and config_bag.option.impl_getrequires() is not None:
             not_allowed_props = properties & getattr(config_bag.option, '_calc_properties', static_set)
             if not_allowed_props:
-                if len(not_allowed_props) == 1:
-                    prop_msg = _('property')
-                    calc_msg = _('this property is calculated')
-                else:
-                    prop_msg = _('properties')
-                    calc_msg = _('those properties are calculated')
-                raise ValueError(_('cannot set {} {} for option "{}" {}'
-                                   '').format(prop_msg, display_list(list(not_allowed_props), add_quote=True),
-                                              config_bag.option.impl_get_display_name(),
-                                              calc_msg))
+                raise ValueError(_('cannot set property {} for option "{}" this property is calculated'
+                                   '').format(display_list(list(not_allowed_props), add_quote=True),
+                                              config_bag.option.impl_get_display_name()))
         if config_bag is None:
             opt = None
         else:
             opt = config_bag.option
         if opt and opt.impl_is_symlinkoption():
-            raise TypeError(_("can't assign properties to the SymLinkOption \"{}\""
+            raise TypeError(_("can't assign property to the SymLinkOption \"{}\""
                               "").format(opt.impl_get_display_name()))
         if 'force_default_on_freeze' in properties and \
                 'frozen' not in properties and \
@@ -599,8 +592,6 @@ class Settings(object):
             raise ConfigError(_('a master ({0}) cannot have '
                                 '"force_default_on_freeze" property without "frozen"'
                                 '').format(opt.impl_get_display_name()))
-        if not isinstance(properties, frozenset):
-            raise TypeError(_('properties must be a frozenset'))
         self._p_.setproperties(path,
                                properties)
         #values too because of slave values could have a PropertiesOptionError has value
@@ -658,7 +649,7 @@ class Settings(object):
         if opt and opt.impl_is_symlinkoption():
             raise TypeError(_("can't reset properties to the SymLinkOption \"{}\""
                               "").format(opt.impl_get_display_name()))
-        if all_properties and (path or opt):  # pragma: optional cover
+        if all_properties and (path or opt):
             raise ValueError(_('opt and all_properties must not be set '
                                'together in reset'))
         if all_properties:
diff --git a/tiramisu/value.py b/tiramisu/value.py
index 966a70c..47dc0ed 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -291,21 +291,18 @@ class Values(object):
                 force_allow_empty_list=False,
                 index=None):
         "convenience method to know if an option is empty"
-        if value is undefined:
-            return False
-        else:
-            empty = opt._empty
-            if index in [None, undefined] and opt.impl_is_multi():
-                if force_allow_empty_list:
-                    allow_empty_list = True
-                else:
-                    allow_empty_list = opt.impl_allow_empty_list()
-                    if allow_empty_list is undefined:
-                        allow_empty_list = opt.impl_is_master_slaves('slave')
-                isempty = value is None or (not allow_empty_list and value == []) or \
-                    None in value or empty in value
+        empty = opt._empty
+        if index in [None, undefined] and opt.impl_is_multi():
+            if force_allow_empty_list:
+                allow_empty_list = True
             else:
-                isempty = value is None or value == empty
+                allow_empty_list = opt.impl_allow_empty_list()
+                if allow_empty_list is undefined:
+                    allow_empty_list = opt.impl_is_master_slaves('slave')
+            isempty = value is None or (not allow_empty_list and value == []) or \
+                None in value or empty in value
+        else:
+            isempty = value is None or value == empty
         return isempty
 
     #______________________________________________________________________
@@ -528,9 +525,6 @@ class Values(object):
         if opt.impl_is_symlinkoption():
             raise ConfigError(_("can't set owner for the SymLinkOption \"{}\""
                                 "").format(opt.impl_get_display_name()))
-        if not isinstance(owner, owners.Owner):
-            raise ConfigError(_("invalid owner {0}").format(str(owner)))
-
         if owner in forbidden_owners:
             raise ConfigError(_('set owner "{0}" is forbidden').format(str(owner)))
 
@@ -653,11 +647,6 @@ class Values(object):
         settings = context.cfgimpl_get_settings()
         # First validate properties with this value
         self_properties = config_bag.properties
-        if self_properties is None:
-            self_properties = settings.getproperties(path,
-                                                     None,
-                                                     config_bag)
-            config_bag.properties = self_properties
         settings.validate_frozen(path,
                                  index,
                                  config_bag)
@@ -693,10 +682,7 @@ class Values(object):
                             config,
                             od_setting_properties):
         settings = context.cfgimpl_get_settings()
-        is_masterslaves = description.impl_is_master_slaves()
-        lenmaster = None
-        optmaster = None
-        pathmaster = None
+#        for option in config.cfgimpl_get_children(self.config_bag):
         for option in description.impl_getchildren(config_bag, context):
             sconfig_bag = config_bag.copy('nooption')
             sconfig_bag.option = option
@@ -704,6 +690,7 @@ class Values(object):
             path = '.'.join(currpath + [name])
 
             if option.impl_is_optiondescription():
+                ori_setting_properties = sconfig_bag.setting_properties
                 sconfig_bag.setting_properties = od_setting_properties
                 try:
                     subconfig = config.getattr(name,
@@ -712,8 +699,9 @@ class Values(object):
                 except PropertiesOptionError as err:
                     pass
                 else:
+                    sconfig_bag.setting_properties = ori_setting_properties
                     for path in self._mandatory_warnings(context,
-                                                         config_bag,
+                                                         sconfig_bag,
                                                          option,
                                                          currpath + [name],
                                                          subconfig,
@@ -729,42 +717,26 @@ class Values(object):
 
                         sconfig_bag.properties = self_properties
                         if 'mandatory' in self_properties or 'empty' in self_properties:
-                            value = config.getattr(name,
-                                                   None,
-                                                   sconfig_bag)
-                            if is_masterslaves:
-                                lenmaster = len(value)
-                                pathmaster = name
-                                optmaster = option
+                            config.getattr(name,
+                                           None,
+                                           sconfig_bag)
                     else:
-                        if lenmaster is None:
-                            # master is a length (so int) if value is already calculated
-                            # otherwise get value and calculate length
-                            nconfig_bag = config_bag.copy('nooption')
-                            nconfig_bag.option = optmaster
-                            values = config.getattr(pathmaster,
-                                                    None,
-                                                    nconfig_bag)
-                            lenmaster = len(values)
-                        for index in range(lenmaster):
+                        for index in range(config.cfgimpl_get_length()):
                             self_properties = settings.getproperties(path,
                                                                      index,
                                                                      sconfig_bag)
 
                             sconfig_bag.properties = self_properties
-                            values = config.getattr(name,
-                                                    index,
-                                                    sconfig_bag)
+                            if 'mandatory' in self_properties:
+                                config.getattr(name,
+                                               index,
+                                               sconfig_bag)
                 except PropertiesOptionError as err:
                     if err.proptype == ['mandatory']:
                         yield path
-                    if is_masterslaves and lenmaster is None:
-                        break
                 except ConfigError as err:
                     #assume that uncalculated value is an empty value
                     yield path
-                    if is_masterslaves and lenmaster is None:
-                        break
 
     def mandatory_warnings(self,
                            config_bag):
@@ -783,10 +755,9 @@ class Values(object):
         config_bag.display_warnings = False
 
         descr = context.cfgimpl_get_description()
-        for path in self._mandatory_warnings(context,
-                                             config_bag,
-                                             descr,
-                                             [],
-                                             context,
-                                             od_setting_properties):
-            yield path
+        return self._mandatory_warnings(context,
+                                        config_bag,
+                                        descr,
+                                        [],
+                                        context,
+                                        od_setting_properties)