diff --git a/tryton/common/selection.py b/tryton/common/selection.py
index 495005010d..902f646f55 100644
--- a/tryton/common/selection.py
+++ b/tryton/common/selection.py
@@ -93,7 +93,7 @@ class SelectionMixin(object):
 
         def _model_evaluator(allowed_models):
             def test(value):
-                return value[0] in allowed_models
+                return value[0] in allowed_models or not allowed_models
             return test
 
         if field.attrs['type'] == 'reference':