Quality Notification - Partner Field on Custom Sub-screen

Dear Gurus,

We are working on an enhancement to the QN transaction, where we have a custom sub-screen and a partner field (2 fields for Internal User for Approvals). In addition, we have the partners tab on one of the standard screens. We are having a hard time making sure the custom field and the field on the Partners tab sync when one or the other is changed.

Wanted to check is someone has implemented something similar and faced as issue like this

Thanks,

KO