=== modified file 'bin/osv/orm.py'
--- bin/osv/orm.py	2010-06-02 14:04:47 +0000
+++ bin/osv/orm.py	2010-06-18 06:57:56 +0000
@@ -2772,7 +2772,8 @@
             if self._inherits[v] not in vals:
                 tocreate[v] = {}
             else:
-                tocreate[v] = {'id' : vals[self._inherits[v]]}
+                if not vals[self._inherits[v]]:
+                    tocreate[v] = {'id' : vals[self._inherits[v]]}
 
         (upd0, upd1, upd2) = ('', '', [])
         upd_todo = []