diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 96f56ee6826..7f8f671dfb0 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -3204,7 +3204,8 @@ class BaseModel(object):
 
         cr.commit()     # start a new transaction
 
-        self._add_sql_constraints(cr)
+        if getattr(self, '_auto', True):
+            self._add_sql_constraints(cr)
 
         if create:
             self._execute_sql(cr)