Primary Keys should be defined by the database at time of INSERT. Not before.
My apology if I could not explain my prob above. My problem is that primary key values in the master region is not populating in the corresponding foreign key columns in detail Interactive Grid region. Thanks.
See in detail region, there is a section call "Master Detail", there you choose the master region for the details region. Then, step on the FK field, and go to section call "Master Detail", there you can choose the master region field which contain the PK for the field.
Hope this is the solution you are looking for.