How to enforce the same project information at project billing and charge account level of Req/PO?

Summary:

When creating a requisition, a user has the ability to add project details in the project billing area. When a project is entered in there, we try to train users that they must also enter in that same project number in the project segment of the charge account string for their requisition. But there are still many scenarios where they may enter it in one place and not the other or the project numbers mismatch. For the first scenario we figured out a BPM condition/rule, where if the value is entered in one area and not the other, it should