diff --git a/ChangeLog b/ChangeLog
index 09f244a..85fdc0d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,8 @@ Sun Oct 26 08:50:38 2014 +0200 Emmanuel Garette <egarette@cadoles.com>
 	* frozen with force_default_on_freeze can change owner
 	* add force_permissive to config __iter__
 	* pass force_permissive to slave for a master or to master for a slave
+	* remove mandatory_warnings in config.py
+	* add force_permissive in mandatory_warnings
 
 Sat Oct 25 22:48:08 2014 +0200 Emmanuel Garette <egarette@cadoles.com>
 	* cannot add unvalaible consistency for an option
diff --git a/test/test_mandatory.py b/test/test_mandatory.py
index 59da145..ae73418 100644
--- a/test/test_mandatory.py
+++ b/test/test_mandatory.py
@@ -211,6 +211,7 @@ def test_mandatory_warnings_ro():
     config.str = 'a'
     config.read_only()
     assert config.cfgimpl_get_values().mandatory_warnings() == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == ['str1', 'unicode2', 'str3']
     sleep(.1)
 
 
@@ -223,6 +224,7 @@ def test_mandatory_warnings_rw():
     assert config.cfgimpl_get_values().mandatory_warnings() == ['str', 'str1', 'unicode2', 'str3']
     config.str = 'a'
     assert config.cfgimpl_get_values().mandatory_warnings() == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == ['str1', 'unicode2', 'str3']
     sleep(.1)
 
 
@@ -236,9 +238,24 @@ def test_mandatory_warnings_disabled():
     assert config.cfgimpl_get_values().mandatory_warnings() == ['str', 'str1', 'unicode2', 'str3']
     setting[descr.str].append('disabled')
     assert config.cfgimpl_get_values().mandatory_warnings() == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == ['str1', 'unicode2', 'str3']
     sleep(.1)
 
 
+def test_mandatory_warnings_hidden():
+    descr = make_description()
+    config = Config(descr)
+    config.str = ''
+    setting = config.cfgimpl_get_settings()
+    config.read_write()
+    config.cfgimpl_get_settings().setpermissive(('hidden',))
+    config.str
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
+    setting[descr.str].append('hidden')
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings(force_permissive=True)) == ['str', 'str1', 'unicode2', 'str3']
+
+
 def test_mandatory_warnings_frozen():
     descr = make_description()
     config = Config(descr)
diff --git a/tiramisu/config.py b/tiramisu/config.py
index da97f9e..6c95a81 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -734,8 +734,3 @@ class MetaConfig(GroupConfig):
             child._impl_meta = weakref.ref(self)
 
         super(MetaConfig, self).__init__(children, session_id, persistent, descr)
-
-
-def mandatory_warnings(config):  # pragma: optional cover
-    #only for retro-compatibility
-    return config.cfgimpl_get_values().mandatory_warnings()
diff --git a/tiramisu/value.py b/tiramisu/value.py
index 6d0ea70..11f6d79 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -441,7 +441,7 @@ class Values(object):
                 raise ValueError(_("information's item"
                                    " not found: {0}").format(key))
 
-    def mandatory_warnings(self):
+    def mandatory_warnings(self, force_permissive=False):
         """convenience function to trace Options that are mandatory and
         where no value has been set
 
@@ -462,7 +462,8 @@ class Values(object):
                     path = opt.impl_getpath(self._getcontext())
                     try:
                         self._get_cached_item(opt, path=path,
-                                              force_properties=frozenset(('mandatory',)))
+                                              force_properties=frozenset(('mandatory',)),
+                                              force_permissive=force_permissive)
                     except PropertiesOptionError as err:
                         if err.proptype == ['mandatory']:
                             _ret.append(path)