IIt’s just a list, I don’t create a BI for this, but you have to decide what to do. I don’t think that this problem will arise often.
You could find 3 types of message
• Old and New are still on your selection.
It means that the user replace the payment term which was a pre-payment term by a new one which is also a pre-payment term = Nothing to do, we created the noted item with the creation of the sales order..