Retrobilling
If price changes are made to a sales contract or to an item because of price renegotiations, the retrobilling functionality can be used to re-invoice previously invoiced items for sales orders and schedules. Price differences are handled through retrobilled sales orders, which have an item quantity of zero and an order amount that includes the price difference.
Retrobilling in Sales
Before you can use retrobilling, you must specify the retrobilling master data. Next, you can generate and invoice retrobilled sales orders.