Hi, I'm still fighting with making my QuotaFolder work with some (imho) buggy code in Zope (mainly caused by exceptiontype-less try: except: constructs) (of course, I could patch the problems in Zope, but I'd still like my product to work without patches) The ObjectManager seems to have support for 'replaceable objects', i.e. when looking at checkValidId: if not allow_dup: obj = getattr(self, id, None) if obj is not None: # An object by the given id exists either in this # ObjectManager or in the acquisition path. flags = getattr(obj, '__replaceable__', NOT_REPLACEABLE) if hasattr(aq_base(self), id): # The object is located in this ObjectManager. if not flags & REPLACEABLE: raise BadRequestException, ('The id "%s" is invalid--' 'it is already in use.' % id) First of all, is allow_dup ever set to true? Does zope support duplicate id's in an ObjectManager anywhere at all? Secondly, can someone give me an example of a Replaceable object? Thanks, Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo@amaze.nl -=-