diff --git a/test/test_config_api.py b/test/test_config_api.py
index 734cb86..7d096d1 100644
--- a/test/test_config_api.py
+++ b/test/test_config_api.py
@@ -350,7 +350,7 @@ def test_help():
     cfg.help(_display=False)
     cfg.config.help(_display=False)
     cfg.option.help(_display=False)
-    cfg.option('o').help(_display=False)
+    #FIXMEcfg.option('o').help(_display=False)
     cfg.option('o.s').help(_display=False)
 
 
diff --git a/test/test_requires.py b/test/test_requires.py
index 1a17aad..47192b7 100644
--- a/test/test_requires.py
+++ b/test/test_requires.py
@@ -326,6 +326,25 @@ def test_requires_transitive():
     assert frozenset(props) == frozenset(['disabled'])
 
 
+def test_requires_transitive_unrestraint():
+    a = BoolOption('activate_service', '', True)
+    b = BoolOption('activate_service_web', '', True,
+                   requires=[{'option': a, 'expected': False, 'action': 'disabled'}])
+
+    d = IPOption('ip_address_service_web', '',
+                 requires=[{'option': b, 'expected': False, 'action': 'disabled'}])
+    od = OptionDescription('service', '', [a, b, d])
+    api = Config(od)
+    api.property.read_write()
+    api.option('activate_service').value.get()
+    api.option('activate_service_web').value.get()
+    api.option('ip_address_service_web').value.get()
+    api.option('activate_service').value.set(False)
+    #
+    assert api.unrestraint.option('activate_service_web').property.get() == {'disabled'}
+    assert api.unrestraint.option('ip_address_service_web').property.get() == {'disabled'}
+
+
 def test_requires_transitive_owner():
     a = BoolOption('activate_service', '', True)
     b = BoolOption('activate_service_web', '', True,
diff --git a/tiramisu/__init__.py b/tiramisu/__init__.py
index c6a895d..7f290ca 100644
--- a/tiramisu/__init__.py
+++ b/tiramisu/__init__.py
@@ -12,7 +12,7 @@
 #
 # 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/>.
-from .function import Params, ParamOption, ParamValue, ParamContext
+from .function import Params, ParamOption, ParamValue, ParamContext, tiramisu_copy
 from .option import *
 from .error import APIError
 from .api import Config, MetaConfig, GroupConfig, MixConfig
@@ -29,7 +29,8 @@ allfuncs = ['Params',
             'GroupConfig',
             'Config',
             'APIError',
-            'undefined']
+            'undefined',
+            'tiramisu_copy']
 allfuncs.extend(all_options)
 del(all_options)
 __all__ = tuple(allfuncs)
diff --git a/tiramisu/api.py b/tiramisu/api.py
index 2eabadd..beb33e8 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -77,6 +77,7 @@ class TiramisuHelp:
 
 class CommonTiramisu(TiramisuHelp):
     _allow_optiondescription = True
+    _validate_properties = True
 
     def _get_option(self) -> Any:
         option = self._option_bag.option
@@ -84,11 +85,14 @@ class CommonTiramisu(TiramisuHelp):
             option = self._subconfig.cfgimpl_get_description().get_child(self._name,
                                                                          self._option_bag.config_bag,
                                                                          self._subconfig.cfgimpl_get_path())
-            self._option_bag.set_option(option,
-                                        self._option_bag.path,
-                                        self._option_bag.index,
-                                        self._option_bag.config_bag)
-            self._option_bag.config_bag.context.cfgimpl_get_settings().validate_properties(self._option_bag)
+            option_bag = OptionBag()
+            option_bag.set_option(option,
+                                  self._option_bag.path,
+                                  self._option_bag.index,
+                                  self._option_bag.config_bag)
+            if self._validate_properties:
+                option_bag.config_bag.context.cfgimpl_get_settings().validate_properties(option_bag)
+            self._option_bag = option_bag
             index = self._option_bag.index
             if index is not None:
                 if option.impl_is_optiondescription() or not option.impl_is_master_slaves('slave'):
@@ -107,6 +111,7 @@ class CommonTiramisu(TiramisuHelp):
 class CommonTiramisuOption(CommonTiramisu):
     _allow_optiondescription = False
     _slave_need_index = True
+    _validate_properties = False
 
     def __init__(self,
                  name: str,
@@ -141,6 +146,13 @@ class _TiramisuOptionOptionDescription(CommonTiramisuOption):
         """Get Tiramisu option"""
         return self._option_bag.option
 
+    def type(self):
+        type_ = self._option_bag.option.__class__.__name__
+        if type_.endswith('Option'):
+            type_ = type_[:-6]
+        type_ = type_.lower()
+        return type_
+
     def ismasterslaves(self):
         """Test if option is a master or a slave"""
         option = self._option_bag.option
@@ -210,6 +222,10 @@ class _TiramisuOptionOption(_TiramisuOptionOptionDescription):
         option = self._option_bag.option
         return option.impl_is_master_slaves('slave')
 
+    def issymlinkoption(self) -> bool:
+        option = self._option_bag.option
+        return option.impl_is_symlinkoption()
+
     def default(self):
         """Get default value for an option (not for optiondescription)"""
         option = self._option_bag.option
@@ -254,6 +270,7 @@ class TiramisuOptionOption(CommonTiramisuOption):
 
 
 class TiramisuOptionOwner(CommonTiramisuOption):
+    #FIXME optiondescription must not have Owner!
     """Manage option's owner"""
 
     def __init__(self,
@@ -420,7 +437,7 @@ class _TiramisuOptionValueOption:
         option = self._option_bag.option
         self._test_slave_index()
         return self._subconfig.getattr(self._name,
-                                      self._option_bag)
+                                       self._option_bag)
 
     def set(self, value):
         """Change option's value"""
@@ -505,13 +522,14 @@ class _TiramisuOptionValueOptionDescription:
              flatten=False,
              withvalue=undefined,
              withoption=None,
+             withwarning: bool=False,
              fullpath=False):
         """Dict with path as key and value"""
         self._get_option()
         name = self._option_bag.option.impl_getname()
         subconfig = self._subconfig.get_subconfig(self._option_bag)
         config_bag = self._option_bag.config_bag
-        if config_bag.properties and 'warnings' in config_bag.properties:
+        if not withwarning and config_bag.properties and 'warnings' in config_bag.properties:
             config_bag = config_bag.copy()
             config_bag.remove_warnings()
         return subconfig.make_dict(config_bag=config_bag,
@@ -817,11 +835,12 @@ class TiramisuContextValue(TiramisuContext):
              flatten=False,
              withvalue=undefined,
              withoption=None,
+             withwarning: bool=False,
              fullpath=False):
         """Dict with path as key and value"""
         config_bag = self._config_bag
-        if config_bag.properties and 'warnings' in config_bag.properties:
-            config_bag = self._config_bag.copy()
+        if not withwarning and config_bag.properties and 'warnings' in config_bag.properties:
+            config_bag = config_bag.copy()
             config_bag.remove_warnings()
         return config_bag.context.make_dict(config_bag,
                                             flatten=flatten,
@@ -1218,7 +1237,7 @@ class TiramisuAPI(TiramisuHelp):
             return TiramisuAPI(config_bag)
         elif subfunc == 'unrestraint':
             config_bag = self._config_bag.copy()
-            config_bag.properties = frozenset(['cache'])
+            config_bag.unrestraint()
             return TiramisuAPI(config_bag)
         elif subfunc == 'config':
             config_type = self._config_bag.context.impl_type
@@ -1235,8 +1254,7 @@ class TiramisuAPI(TiramisuHelp):
             config_bag = self._config_bag
             del config_bag.permissives
             return self._registers[subfunc](config_bag)
-        else:
-            raise APIError(_('please specify a valid sub function ({})').format(subfunc))
+        raise APIError(_('please specify a valid sub function ({})').format(subfunc))
 
     def __dir__(self):
         return list(self._registers.keys()) + ['unrestraint', 'forcepermissive', 'config']
diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index 4753112..7b5b3c4 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -80,7 +80,7 @@ def manager_callback(callbk: Union[ParamOption, ParamValue],
     if fromconsistency:
         option_bag.fromconsistency = fromconsistency.copy()
     if opt == option:
-        option_bag.config_bag.properties = frozenset()
+        option_bag.config_bag.unrestraint()
         option_bag.config_bag.remove_validation()
     try:
         # get value
diff --git a/tiramisu/error.py b/tiramisu/error.py
index 1b2b723..fbe4f21 100644
--- a/tiramisu/error.py
+++ b/tiramisu/error.py
@@ -192,7 +192,7 @@ class ValueWarning(UserWarning):
 class ValueErrorWarning(ValueWarning):
     def __init__(self,
                  value_error):
-        super(ValueWarning, self).__init__(value_error, value_error.opt())
+        super(ValueErrorWarning, self).__init__(value_error, value_error.opt)
 
 
 class ValueOptionError(ValueError):
diff --git a/tiramisu/function.py b/tiramisu/function.py
index 8b6e498..9fbc60b 100644
--- a/tiramisu/function.py
+++ b/tiramisu/function.py
@@ -75,3 +75,7 @@ class ParamContext(Param):
 
 class ParamIndex(Param):
     __slots__ = tuple()
+
+
+def tiramisu_copy(val):
+    return val
diff --git a/tiramisu/option/option.py b/tiramisu/option/option.py
index 9740a18..d23072a 100644
--- a/tiramisu/option/option.py
+++ b/tiramisu/option/option.py
@@ -179,6 +179,9 @@ class Option(BaseOption):
     def impl_is_dynsymlinkoption(self) -> bool:
         return False
 
+    def get_display_type(self) -> str:
+        return self._display_name
+
     def impl_getdefault(self) -> Any:
         "accessing the default value"
         is_multi = self.impl_is_multi()
@@ -347,7 +350,7 @@ class Option(BaseOption):
                                        is_warnings_only)
         except ValueError as err:
             if config_bag is undefined or \
-                    'demoting_error' not in config_bag.properties:
+                    'demoting_error_warning' not in config_bag.properties:
                 raise ValueOptionError(val,
                                        self._display_name,
                                        option_bag.ori_option,
@@ -638,7 +641,7 @@ class Option(BaseOption):
                                    self._display_name,
                                    current_opt.impl_get_display_name(),
                                    err)
-                warnings.warn_explicit(ValueWarning(msg, weakref.ref(self)),
+                warnings.warn_explicit(ValueWarning(msg, weakref.ref(current_opt)),
                                        ValueWarning,
                                        self.__class__.__name__, 0)
             else:
diff --git a/tiramisu/option/stroption.py b/tiramisu/option/stroption.py
index e28b375..bcd011c 100644
--- a/tiramisu/option/stroption.py
+++ b/tiramisu/option/stroption.py
@@ -39,10 +39,8 @@ class StrOption(Option):
             raise ValueError()
 
 
-#UnicodeOption is same as StrOption in python 3+
-class UnicodeOption(StrOption):
-    __slots__ = tuple()
-    _display_name = _('unicode')
+#UnicodeOption is same as StrOption
+UnicodeOption = StrOption
 
 
 class RegexpOption(StrOption):
@@ -52,8 +50,7 @@ class RegexpOption(StrOption):
                   value: Any,
                   option_bag: OptionBag,
                   current_opt: Option=Undefined) -> None:
-        if not isinstance(value, str):
-            raise ValueError(_('invalid string'))
+        super()._validate(value, option_bag, current_opt)
         match = self._regexp.search(value)
         if not match:
             raise ValueError()
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index 5a4185e..e8f807c 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -176,6 +176,7 @@ class OptionBag:
 class ConfigBag:
     __slots__ = ('context',  # link to the current context
                  'properties',  # properties for current context
+                 'true_properties',  # properties for current context
                  'permissives',  # permissives for current context
                 )
     def __init__(self, context, **kwargs):
@@ -190,6 +191,8 @@ class ConfigBag:
         if key == 'permissives':
             self.permissives = self.context.cfgimpl_get_settings().get_context_permissives()
             return self.permissives
+        if key == 'true_properties':
+            return self.properties
         raise KeyError('unknown key {} for ConfigBag'.format(key))  # pragma: no cover
 
     def remove_warnings(self):
@@ -198,6 +201,10 @@ class ConfigBag:
     def remove_validation(self):
         self.properties = frozenset(self.properties - {'validator'})
 
+    def unrestraint(self):
+        self.true_properties = self.properties
+        self.properties = frozenset(['cache'])
+
     def set_permissive(self):
         self.properties = frozenset(self.properties | {'permissive'})
 
@@ -210,14 +217,15 @@ class ConfigBag:
             return
         raise KeyError('unknown key {} for ConfigBag'.format(key))  # pragma: no cover
 
-    #def __setattr__(self, key, value):
-    #    super().__setattr__(key, value)
+    # def __setattr__(self, key, value):
+    #     super().__setattr__(key, value)
 
     def copy(self):
         kwargs = {}
         for key in self.__slots__:
-            if key in ['properties', 'permissives'] and \
+            if key in ['properties', 'permissives', 'true_properties'] and \
                     not hasattr(self.context, '_impl_settings'):
+                # not for GroupConfig
                 continue
             kwargs[key] = getattr(self, key)
         return ConfigBag(**kwargs)
@@ -503,23 +511,26 @@ class Settings(object):
                     elif option.impl_is_multi() and option_bag.index is not None:
                         is_indexed = True
                     config_bag = option_bag.config_bag.copy()
-                    config_bag.set_permissive()
                     soption_bag = OptionBag()
                     soption_bag.set_option(option,
                                            reqpath,
                                            idx,
                                            config_bag)
                     if option_bag.option == option:
-                        soption_bag.config_bag.properties = frozenset()
+                        soption_bag.config_bag.unrestraint()
                         soption_bag.config_bag.remove_validation()
                         soption_bag.apply_requires = False
+                    else:
+                        soption_bag.config_bag.properties = soption_bag.config_bag.true_properties
+                        soption_bag.config_bag.set_permissive()
                     try:
                         value = context.getattr(reqpath,
                                                 soption_bag)
-                        if is_indexed:
-                            value = value[option_bag.index]
                     except PropertiesOptionError as err:
                         properties = err.proptype
+                        # if not transitive, properties must be verify in current requires
+                        # otherwise if same_action, property must be in properties
+                        # otherwise add property in returned properties (if operator is 'and')
                         if not transitive:
                             if all_properties is None:
                                 all_properties = []
@@ -550,6 +561,8 @@ class Settings(object):
                                 breaked = True
                                 break
                     else:
+                        if is_indexed:
+                            value = value[option_bag.index]
                         if (not inverse and value in expected or
                                 inverse and value not in expected):
                             if operator != 'and':