Way to utilize custom cost code attribute in a Payment Application bp?

Hello.

We have a Cost, Line Item with CBS Code, Payment Application bp in which we are trying to identify whether a select cost code is being used on the Pay App line item by utilizing a custom cost code attribute.

We aren’t able to do this as the cost code attribute doesn’t populate into the line item. Is there a way to get Pay App to recognize this attribute as the system does for Contracts/COs (Cost Line Item with CBS Code, Base Commit)? Are we missing something in our set-up or does this functionality just not work for Pay Application bps?