diff --git a/test/test_option_setting.py b/test/test_option_setting.py
index 83009e1..cf6914d 100644
--- a/test/test_option_setting.py
+++ b/test/test_option_setting.py
@@ -429,3 +429,45 @@ def test_properties_cached():
     option
     c._setattr('sub.b1', True, force_permissive=True)
     assert str(setting[b1]) in ["['test']", "[u'test']"]
+
+
+
+def test_append_properties_force_store_value():
+    gcdummy = BoolOption('dummy', 'dummy', default=False, properties=('force_store_value',))
+    gcgroup = OptionDescription('gc', '', [gcdummy])
+    descr = OptionDescription('tiramisu', '', [gcgroup])
+    cfg = Config(descr)
+    setting = cfg.cfgimpl_get_settings()
+    option = cfg.cfgimpl_get_description().gc.dummy
+    assert tuple(option._properties) == tuple(['force_store_value'])
+    assert not 'test' in setting[option]
+    setting[option].append('test')
+    assert tuple(option._properties) == tuple(['force_store_value'])
+    assert 'test' in setting[option]
+
+
+def test_reset_properties_force_store_value():
+    gcdummy = BoolOption('dummy', 'dummy', default=False, properties=('force_store_value',))
+    gcgroup = OptionDescription('gc', '', [gcdummy])
+    descr = OptionDescription('tiramisu', '', [gcgroup])
+    cfg = Config(descr)
+    setting = cfg.cfgimpl_get_settings()
+    option = cfg.cfgimpl_get_description().gc.dummy
+    assert setting._p_.get_modified_properties() == {}
+    setting.append('frozen')
+    assert setting._p_.get_modified_properties() == {None: set(('frozen', 'expire', 'cache', 'validator', 'warnings'))}
+    setting.reset()
+    assert setting._p_.get_modified_properties() == {}
+    setting[option].append('test')
+    assert setting._p_.get_modified_properties() == {'gc.dummy': set(('test', 'force_store_value'))}
+    setting.reset()
+    assert setting._p_.get_modified_properties() == {'gc.dummy': set(('test', 'force_store_value'))}
+    setting.append('frozen')
+    assert setting._p_.get_modified_properties() == {None: set(('frozen', 'expire', 'validator', 'cache', 'warnings')), 'gc.dummy': set(('test', 'force_store_value'))}
+    setting.reset(option)
+    assert setting._p_.get_modified_properties() == {None: set(('frozen', 'expire', 'validator', 'cache', 'warnings'))}
+    setting[option].append('test')
+    assert setting._p_.get_modified_properties() == {None: set(('frozen', 'expire', 'validator', 'cache', 'warnings')), 'gc.dummy': set(('test', 'force_store_value'))}
+    setting.reset(all_properties=True)
+    assert setting._p_.get_modified_properties() == {}
+    raises(ValueError, 'setting.reset(all_properties=True, opt=option)')
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index bfb1fc5..94765a3 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -263,9 +263,11 @@ class Property(object):
             raise ValueError(_('cannot append {0} property for option {1}: '
                                'this property is calculated').format(
                                    propname, self._opt.impl_getname()))
+        if propname in forbidden_set_properties:
+            raise ConfigError(_('cannot add those properties: {0}').format(propname))
         self._properties.add(propname)
         if save:
-            self._setting._setproperties(self._properties, self._path)
+            self._setting._setproperties(self._properties, self._path, force=True)
 
     def remove(self, propname):
         """Removes a property named propname
@@ -417,14 +419,17 @@ class Settings(object):
         for propname in propnames:
             self.append(propname)
 
-    def _setproperties(self, properties, path):
+    def _setproperties(self, properties, path, force=False):
         """save properties for specified path
         (never save properties if same has option properties)
         """
-        forbidden_properties = forbidden_set_properties & properties
-        if forbidden_properties:
-            raise ConfigError(_('cannot add those properties: {0}').format(
-                ' '.join(forbidden_properties)))
+        if not force:
+            forbidden_properties = forbidden_set_properties & properties
+            if forbidden_properties:
+                print "super ..."
+                raise Exception('pouet')
+                raise ConfigError(_('cannot add those properties: {0}').format(
+                    ' '.join(forbidden_properties)))
         self._p_.setproperties(path, properties)
         self._getcontext().cfgimpl_reset_cache()