PO Confirmation Qty, Delivery Schedule, Inbound Delivery - Qty reduced
I have a scenario and I am not sure if you could help me explain the logic behind it.
Today's Date = 11/17/2007
PO Quantity = 1000 EA
Delivery Schedule Date = 11/30/2007 1000 EA
AB confirmed line = 11/20/2007 300 EA
Quantity Reduced column under the AB line = 300EA
LA confirmed line (from inbound delivery) = 11/26/2007 300 EA
When you look at MRP, the system shows that incoming quantity is 300 EA because LA confirmation type has priority over the AB confirmation type.
However, When the delivery schedule date (e.g. 11/17/2007) equals or is earlier than the AB confirmation date (e.g.11/20/2007), the quantity reduced column under the AB line = 0 EA. This causes an over-confirmation of the incoming quantity. The system thinks that there are 600 EA coming but there are actually only 300 EA coming.
Could you please tell me what the SAP underlying logic is in coming up with the cumulative confirmed quantity? Thank you,