Authentication providers in weblogic

Hi,

We have a requirement where we need to authenticate OIM users against AD and OID.We have two sets of users-Employees and Contractors.

Employees will be authenticating against AD and Contractors will be authenticating OID.We can do so by using multiple authentication providers.But the main problem is that everytime when a user logs in it will be authenticated in both the providers if the authentication fails in one of those.Our requirement is that can we do the authentication based on user type.Like employees will be authenticated only against AD authenticator and contractors will be authenticated only against OID authenticator.Please tell if we can do this thing.