Diagnosis
Goods issue has not yet been posted for the delivery that you haveselected.
Note that when you have not maintained the cumulative received quantityin the delivery schedule, the system automatically sets it to match thecumulative delivered quantity from this delivery, whether or not goodsissue has been posted.
Consequently, the system recalculates the open quantity based on thisdelivery.

Procedure
If you have not posted goods issue for a delivery, do not assign it inthe system unless there has been an actual physical movement of thegoods to the customer. Otherwise the system will give you a distortedpicture of the delivery situation.
The system does not take correction deliveries into account whenchecking for goods issue.