Jan, please follow-up on the mailing list (Cc:-ed) so others can answer and learn as well. Jan Beerden wrote: > We already tried that. We are trying to prevent user1 to have an email alias > that is the same as user2's primary email address. > [..] > What we would like is that a certain value (email address) has to be unique > across both the email and the alias attribute. Uniqueness is only per attribute. So this is not possible. Ciao, Michael.
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