diff --git a/test/test_option_calculation.py b/test/test_option_calculation.py
index e0a5375..3ecd047 100644
--- a/test/test_option_calculation.py
+++ b/test/test_option_calculation.py
@@ -6,7 +6,7 @@ from py.test import raises
 from tiramisu.config import Config
 from tiramisu.setting import groups, owners
 from tiramisu.option import ChoiceOption, BoolOption, IntOption, FloatOption, \
-    StrOption, OptionDescription, SymLinkOption
+    StrOption, OptionDescription, SymLinkOption, IPOption, NetmaskOption
 from tiramisu.error import PropertiesOptionError, ConflictError, SlaveError, ConfigError
 
 
@@ -480,6 +480,46 @@ def test_callback_master_and_slaves_master4():
     assert list(cfg.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == []
 
 
+def test_callback_master_and_slaves_master_mandatory_transitive():
+    #default value
+    val1 = IPOption('val1', "", ['192.168.0.1'], multi=True, properties=('mandatory',))
+    val2 = NetmaskOption('val2', "", multi=True, default_multi='255.255.255.0', properties=('disabled', 'mandatory'))
+    val2.impl_add_consistency('ip_netmask', val1)
+    #no value
+    val3 = IPOption('val3', "", multi=True, properties=('mandatory',))
+    val4 = NetmaskOption('val4', "", multi=True, default_multi='255.255.255.0', properties=('disabled', 'mandatory'))
+    val4.impl_add_consistency('ip_netmask', val3)
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    interface2 = OptionDescription('val3', '', [val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    interface2.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, interface2])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    raises(PropertiesOptionError, "cfg.val1.val1")
+    raises(PropertiesOptionError, "cfg.val3.val3")
+    assert list(cfg.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == []
+
+
+def test_callback_master_and_slaves_master_mandatory_non_transitive():
+    #no value
+    val1 = IPOption('val1', "", multi=True, properties=('mandatory',))
+    val2 = NetmaskOption('val2', "", multi=True, default_multi='255.255.255.0', properties=('disabled', 'mandatory'))
+    val2.impl_add_consistency('ip_netmask', val1, transitive=False)
+    #default value
+    val3 = IPOption('val3', "", ['192.168.0.1'], multi=True, properties=('mandatory',))
+    val4 = NetmaskOption('val4', "", multi=True, default_multi='255.255.255.0', properties=('disabled', 'mandatory'))
+    val4.impl_add_consistency('ip_netmask', val3, transitive=False)
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    interface2 = OptionDescription('val3', '', [val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    interface2.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, interface2])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert list(cfg.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == ["val1.val1"]
+
+
 def test_callback_master_and_slaves_master_list():
     val1 = StrOption('val1', "", multi=True, callback=return_list)
     val2 = StrOption('val2', "", multi=True)
diff --git a/tiramisu/option/baseoption.py b/tiramisu/option/baseoption.py
index 08ece6a..2a75efa 100644
--- a/tiramisu/option/baseoption.py
+++ b/tiramisu/option/baseoption.py
@@ -387,6 +387,7 @@ class Option(OnlyOption):
             descr = context.cfgimpl_get_description()
 
         all_cons_vals = []
+        val_consistencies = True
         for opt in all_cons_opts:
             #get value
             if (isinstance(opt, DynSymLinkOption) and option._dyn == opt._dyn) or \
@@ -406,11 +407,11 @@ class Option(OnlyOption):
                         if isinstance(opt_value, PropertiesOptionError):
                             log.debug('propertyerror in _launch_consistency: {0}'.format(opt_value))
                             if transitive:
-                                raise opt_value
+                                return opt_value
                             else:
                                 return
                         else:
-                            raise opt_value
+                            return opt_value
                 else:
                     opt_value = opt.impl_getdefault()
 
@@ -419,12 +420,14 @@ class Option(OnlyOption):
                                             and option._dyn == opt._dyn) or \
                     option == opt:
                 all_cons_vals.append(opt_value)
-            #consistency with submulti is now forbidden
-            #elif self.impl_is_submulti():
-            #    all_cons_vals.append(opt_value[index][submulti_index])
             else:
-                all_cons_vals.append(opt_value[index])
-        return getattr(self, func)(all_cons_opts, all_cons_vals, warnings_only)
+                if index is not None:
+                    all_cons_vals.append(opt_value[index])
+                else:
+                    #only check properties for slaves
+                    val_consistencies = False
+        if val_consistencies:
+            return getattr(self, func)(all_cons_opts, all_cons_vals, warnings_only)
 
     def impl_validate(self, value, context=undefined, validate=True,
                       force_index=None, force_submulti_index=None,
@@ -502,6 +505,8 @@ class Option(OnlyOption):
                         warning = ret
                     elif isinstance(ret, ValueError):
                         error = ret
+                    else:
+                        return ret
             if warning:
                 msg = _("warning on the value of the option {0}: {1}").format(
                     self.impl_getname(), warning)
@@ -554,6 +559,9 @@ class Option(OnlyOption):
                 err = do_validation(val, idx, force_submulti_index)
                 if err:
                     return err
+            else:
+                return self._valid_consistency(current_opt, None, context,
+                                              None, None)
 
     def impl_is_master_slaves(self, type_='both'):
         """FIXME