Account via Bluegroup/LDAP

Hello,
I'm the Administrator of the Rational Team Concert Application in the Rome SWG Lab. and I've a question regarding the Bluepages.
I've setup the Application access using the LDAP/Bluegroup and discovered a problem with Bluepages ...
Bluepages allow tthe user to change his primary Intranet Id ... this Id is used by the Application as credential to Login ... so changing the primary
id the user will not be able to Login anymore.
Any suggestion?
Best Regards,
Adriano