Correcting Cumulative Quantities - Delivery Orders 
Prerequisites
You adjust cumulative quantities in scheduling agreements for delivery orders:
If you are correcting cumulative quantities on the basis of a return, use the special
return for delivery orders (type RM).Correct cumulative quantities only when the customer has not posted goods receipt.
Procedure
Scroll right in the sales overview to the Item category field. Enter MAK1 to reduce the cumulative quantity, or MAK to increase the cumulative quantity.
Result
When you save the correction document, the system updates the cumulative quantities in the forecast delivery schedule.