diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index d4a5d808990..8de5c829402 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -4050,7 +4050,7 @@ class orm(orm_template):
         (upd0, upd1, upd2) = ('', '', [])
         upd_todo = []
         for v in vals.keys():
-            if v in self._inherit_fields:
+            if v in self._inherit_fields and v not in self._columns:
                 (table, col, col_detail) = self._inherit_fields[v]
                 tocreate[table][v] = vals[v]
                 del vals[v]