Branch Relationships - Using Supplier Rebate Code (UDC 41 P3)

We upgraded our JDE software last year so I'm wondering if there is a change in process or something that I'm not understanding.

In the past, we have set up our Branch Relationships using the UDC Product Code 41 and User Defined Code P3 (Supplier Rebate Code).  Note that MRP is working using that setup.

However, when I go in to set up a new Branch Relationship or change an existing one, the prompt is for UDC 41 with P4 (Master Planning Family).  I get a red error if I try to change the existing and I cannot set up a new branch using the P3 code.  There are no other fields as an option to enter the P3 UDC.