You can specify a work day calendar when entering a due date rule, but will the advance payment term

No, the due date rule on the Due Date Rule Revisions program (P00146) does not allow you to specify a calendar name when adding a work day calendar. The advance payment terms processing utilizes the Compute Due Date For Advanced Payment Terms program (X03021) to calculate due dates, which does not use a specific calendar name to retrieve the workday calendar to use in the advance payment term calculation.  As a result, when you add more than one calendar name for a calendar (branch), the system uses the first calendar record located for the specific calendar (branch), type, century, month,