mailLocalAddress not allowed

Hello! i come here because i have a little problem with virtualmin.
When i add a new user in LDAP with virtualmin that hasn’t any other mail aliases, there is no problems.
When i add new aliases with virtualmin, there is no problems.
BUT when i want to add an user with an other alias, virtualmin throws this error :

Failed to modify user in LDAP database : attribute ‘mailLocalAddress’ not allowed

So i have to add the user without aliases and add aliases with the “Modify aliases for virtual server” module.

Could anybody help with this issue?