after billing, delievery, to payment recieved, we have done the necessary configuration. but now the scenario is, custmer has amended the next PO with new price, but the effective date is before 3 months back date, now we have to capture the differential amount before 3 months back date, where goods are already delievered / billed and received the payment. now we have to cofigure the pricing procedure without effecting the normal billing, and we have to enter the conditions mannually like basic price, excise duty etc., how to achieve this scenario / configure this scenario in sap,
regards,