Can't create alias and domain maps with LDAP backend for Postfix

LDAP validation check works, I can add users and use them. When i try to create a domain everything is working, but i see these two error messages:

Creating aliases for administration user ..
.. aliases failed : LDAP add of mailLocalAddress=demo@demo.com,dc=virtual,dc=my-domain,dc=com failed : mailLocalAddress: value #0 provided more than once at ../web-lib-funcs.pl line 980.

Adding to email domains list ..
.. Mail for domain failed! : LDAP add of mailLocalAddress=demo.com,dc=virtual,dc=my-domain,dc=com failed : mailLocalAddress: value #0 provided more than once at ../web-lib-funcs.pl line 980.

Same error message under CentOS 5.