In OFS.Findsupport, line 159, I found if hasattr(ob, 'aq_base'): bs=ob.aq_base if ( (not obj_ids or absattr(bs.id) in obj_ids) [...] That is a conditional assignment to bs, an bs is used later on in any case. Shouldn't there be an else-fork, like if hasattr(ob, 'aq_base'): bs=ob.aq_base else: bs=ob if the object is accessed without an aquisition wrapper? This lead to an error with one of my products, but propably my product is still faulty, and this only reveals the above problems. Stefan