How to pass values for compound primary keys for updating the record in db.

i have a entity bean in my ejb with two primary keys to it...eg. roleid,rolename...
when iam retriving the record i use only one primary key ...so again to modify and update he same record which i retrived is a pbm..
i cannot set the values for the compoundpk,,,
but i can do the update for the bean with single primary key..
i need to know how to pass the values/parameters for the coumpound primary key in my update method...
thanx in advance...
Arjun.G

I istantiated a object for the pk class and assign the values for the primary key fields...
Arjun.G

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