Example: A contract exists with a performance obligation with an order line linked to the obligation. The order revenue has been recognized and posted to the sales account. You add another order line that has been invoiced already but you cannot recognize the revenue for another six months. When the revenue recognition process is run, the revenue of the new order line is deferred and a posting moves the revenue from the sales account to the deferred revenue account. However, the revenue recognition process also defers the revenue for the original order line that has already been recognized because the revenue of the performance obligation must be deferred and recognized as a whole. In this case, you have changed the overall conditions of the performance obligation by adding the new order line.