diff --git a/mass_editing/mass_editing.py b/mass_editing/mass_editing.py
index 8db6c4c..9426ec9 100644
--- a/mass_editing/mass_editing.py
+++ b/mass_editing/mass_editing.py
@@ -50,7 +50,7 @@ class mass_object(orm.Model):
                                                  of the related document model"),
         'ref_ir_value':fields.many2one('ir.values', 'Sidebar Button', readonly=True,
                                        help="Sidebar button to open the sidebar action"),
-        'model_list': fields.char('Model List', size=256)
+        'model_ids': fields.many2many('ir.model', string='Model List')
     }
 
     _sql_constraints = [
@@ -60,15 +60,15 @@ class mass_object(orm.Model):
     def onchange_model(self, cr, uid, ids, model_id, context=None):
         if context is None: context = {}
         if not model_id:
-            return {'value': {'model_list': ''}}
-        model_list = [model_id]
+            return {'value': {'model_ids': [(6, 0, [])]}}
+        model_ids = [model_id]
         model_obj = self.pool.get('ir.model')
         active_model_obj = self.pool.get(model_obj.browse(cr, uid, model_id).model)
         if active_model_obj._inherits:
             for key, val in active_model_obj._inherits.items():
-                model_ids = model_obj.search(cr, uid, [('model', '=', key)], context=context)
-                model_list += model_ids
-        return {'value': {'model_list': str(model_list)}}
+                found_model_ids = model_obj.search(cr, uid, [('model', '=', key)], context=context)
+                model_ids += found_model_ids
+        return {'value': {'model_ids': [(6, 0, model_ids)]}}
 
     def create_action(self, cr, uid, ids, context=None):
         vals = {}
diff --git a/mass_editing/mass_editing_view.xml b/mass_editing/mass_editing_view.xml
index c304b81..f0b3e71 100644
--- a/mass_editing/mass_editing_view.xml
+++ b/mass_editing/mass_editing_view.xml
@@ -10,11 +10,11 @@
                 <form string="Object">
                     <field name="name"/>
                     <field name="model_id" on_change="onchange_model(model_id)"/>
-                    <field name="model_list" invisible="1"/>
+                    <field name="model_ids" invisible="1"/>
                     <notebook colspan="4">
                         <page string="Fields">
                             <field name="field_ids" colspan="4" nolabel="1"
-                                domain="[('ttype', 'not in', ['one2many', 'reference', 'function']), ('model_id', 'in', model_list)]"/>
+                                domain="[('ttype', 'not in', ['one2many', 'reference', 'function']), ('model_id', 'in', model_ids[0][2])]"/>
                         </page>
                         <page string="Advanced">
                             <group colspan="2" col="2">