[Dovecot] One LDAP attribute for many variables

Hi

Using Dovecot 1.1.2 with LDAP. If i have this:

user_attrs = uid=home=/var/vmail/%$,mailuserquota=quota_rule=*:storage=%$,=mail=maildir:/var/vmail/%n/Maildir

OK. But if i have this:

user_attrs = uid=home=/var/vmail/%$,mailuserquota=quota_rule=*:storage=%$,uid=mail=maildir:/var/vmail/%$/Maildir

I get this error:

deliver(usuario1): Jul 25 12:59:08 Error: Per-user script path is unknown. See http://wiki.dovecot.org/LDA/Sieve#location

The only difference is that I use the uid LDAP attribute twice. Why does this happen?