Oracle EBS - R12.2.12 - Order Management payment term default

There are times when the main customer account on the order is different than the bill to customer account on the order. So 2 different customers on the order. We put the payment terms on the main customer of the bill to (not on the business purpose site usage). The issue is the defaulting rules only look at the main customer or at the bill to site usage - but not on the main customer of the bill to. Is there a way to look at the main customer of the bill to and default it accordingly