I tried to create a set of persons with no account name, manually editing the filter definition. As suggested in a previous thread (XPath Filters for Null Entries ), I tried /Person[not(AccountName!='x')] /Person[AccountName != /Person/AccountName] But I always get a 'request failed' error. The request details don't provide much information, it just looks like the administrator filter validation activity failed. Thanks for any help, PaoloPaolo Tedesco - http://cern.ch/idm

Is there anything in the event log? Have you seen these: Jorge's way to create the empty value set Rebecca's way to create the empty value set

other way here for displayName http://social.technet.microsoft.com/Forums/en/ilm2/thread/64f3f2d8-17bf-4578-8b53-c95011a31edf

Thanks for your answers; from the posts you mentioned, I see that a double negation (not ... !=) is no longer supported. Instead, the filter starts-with(AccountName,'%') works. Thanks, PaoloPaolo Tedesco - http://cern.ch/idm