diff --git a/test/test_duplicate_config.py b/test/test_duplicate_config.py
index 4c042fc..f745fbc 100644
--- a/test/test_duplicate_config.py
+++ b/test/test_duplicate_config.py
@@ -3,7 +3,7 @@ from .autopath import do_autopath
 do_autopath()
 
 from tiramisu.setting import groups
-from tiramisu import Config
+from tiramisu import Config, MetaConfig
 from tiramisu import ChoiceOption, BoolOption, IntOption, \
     StrOption, OptionDescription
 from .test_state import _diff_opts, _diff_conf
@@ -72,3 +72,14 @@ def test_copy_force_store_value():
     conf.option('creole.general.wantref').value.set(True)
     assert to_tuple(conf.value.exportation()) == (('creole.general.wantref',), (None,), (True,), ('user',))
     assert to_tuple(conf2.value.exportation()) == (('creole.general.wantref',), (None,), (False,), ('forced',))
+
+
+def test_copy_force_store_value_metaconfig():
+    descr = make_description()
+    meta = MetaConfig([], optiondescription=descr)
+    conf = meta.config.new(session_id='conf')
+    assert to_tuple(conf.value.exportation()) == (('creole.general.wantref',), (None,), (False,), ('forced',))
+    assert to_tuple(meta.value.exportation()) == (('creole.general.wantref',), (None,), (False,), ('forced',))
+    conf.option('creole.general.wantref').value.set(True)
+    assert to_tuple(conf.value.exportation()) == (('creole.general.wantref',), (None,), (True,), ('user',))
+    assert to_tuple(meta.value.exportation()) == (('creole.general.wantref',), (None,), (False,), ('forced',))
diff --git a/tiramisu/api.py b/tiramisu/api.py
index 44d4731..d7377e5 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -997,8 +997,10 @@ class TiramisuContextConfig(TiramisuContext):
     def _c_meta(self):
         return Config(self.config_bag.context.cfgimpl_get_meta())
 
-    def _m_new(self, name):
-        return Config(self.config_bag.context.new_config(name))
+    def _m_new(self,
+               session_id,
+               persistent=False):
+        return Config(self.config_bag.context.new_config(session_id=session_id, persistent=persistent))
 
     def _m_list(self):
         return self._g_list()
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 9b83096..4a27cb7 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -770,7 +770,7 @@ class KernelConfig(_CommonConfig):
                          weakref.ref(self),
                          ConfigBag(self),
                          None)
-        if _duplicate is False and (force_settings is None or force_values is None):
+        if None in [force_settings, force_values]:
             self._impl_build_all_caches()
         self._impl_name = session_id
 
@@ -986,12 +986,14 @@ class KernelMetaConfig(KernelGroupConfig):
             if not _duplicate:
                 new_children = []
                 for child_session_id in children:
+                    if not isinstance(child_session_id, str):
+                        raise TypeError(_('MetaConfig with optiondescription must have '
+                                          'string has child, not {}').format(child_session_id))
                     new_children.append(KernelConfig(optiondescription,
                                                      persistent=persistent,
                                                      session_id=child_session_id))
                 children = new_children
-            else:
-                descr = optiondescription
+            descr = optiondescription
         for child in children:
             if not isinstance(child, _CommonConfig):
                 try:
@@ -1016,6 +1018,7 @@ class KernelMetaConfig(KernelGroupConfig):
                          force_values=force_values,
                          storage=storage,
                          _descr=descr)
+        self._impl_build_all_caches()
 
     def set_value(self,
                   path,