diff --git a/tiramisu/option.py b/tiramisu/option.py
index 09e0dbd..ad99416 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -453,12 +453,9 @@ class Option(BaseOption):
             for index, val in enumerate(value):
                 do_validation(val, index)
 
-    def impl_getdefault(self, default_multi=False):
+    def impl_getdefault(self):
         "accessing the default value"
-        if not default_multi or not self.impl_is_multi():
-            return self._default
-        else:
-            return self.getdefault_multi()
+        return self._default
 
     def impl_getdefault_multi(self):
         "accessing the default value for a multi"
@@ -1256,7 +1253,6 @@ class OptionDescription(BaseOption):
             self._group_type = group_type
             if isinstance(group_type, groups.MasterGroupType):
                 #if master (same name has group) is set
-                identical_master_child_name = False
                 #for collect all slaves
                 slaves = []
                 master = None
@@ -1273,7 +1269,6 @@ class OptionDescription(BaseOption):
                                          ": this option is not a multi"
                                          "").format(child._name, self._name))
                     if child._name == self._name:
-                        identical_master_child_name = True
                         child._multitype = multitypes.master
                         master = child
                     else:
@@ -1294,9 +1289,6 @@ class OptionDescription(BaseOption):
                     if child != master:
                         child._master_slaves = master
                         child._multitype = multitypes.slave
-                if not identical_master_child_name:
-                    raise ValueError(_("no child has same name has master group"
-                                       " for: {0}").format(self._name))
         else:
             raise ValueError(_('group_type: {0}'
                                ' not allowed').format(group_type))