If the purchase line is updated, and the Remaining quantityplus Deliver remainderfields are less than the quantity originally ordered, this is an under-delivery. Under-deliveries are permitted only if you previously selected the purchase parameter Accept underdelivery.

However, if the purchase line is updated, and the Remaining quantityfield added to the Deliver remainderfield is greater than the quantity originally ordered, this is an over-delivery. Over-deliveries are permitted only if you previously selected the purchase parameter Accept overdelivery.

The field enables you to specify a new backorder. This means that you can decide when a purchase line should have its status changed to delivered in full.