Outer identity being used for LDAP group lookup in users file

In my "users" file I preform an Ldap-Group lookup and allocate vlan based on this. i.e. DEFAULT Ldap-Group != "cn=DisabledRadiusUsers,ou=roles,ou=services,o=abc" The issue I am having is if a user has an Outer Identity set, the Ldap-Group lookup is performed against this username not the Inner Identity username. Is there any way of ensuring that the lookup is performed against the "real" inner identity not the "fake" outer identity? Cheers, Paul