Hi,
I cannot fully understand what is the logic behind the consumption of the forecast delivery schedule lines. This is how the problem can be exactly defined:
- scheduling agreement with delivery orders (LZM)
- JIT delivery schedules are not used and no delivery schedule is maintained... just a forecast delivery schedule
- the whole process is manual, there is no EDI implied
- the cumulative received quantity is updated by an ABAP development that is triggered at delivery goods issue
The rest, happens normal - forecast schedule lines are updated weekly, the customer send pick-up sheets, a TAM delivery order is created, then delivery, GI...
The problem: not always the MRP requirements generated by the forecast delivery schedule lines are consumed by the delivery order/GI. If the delivery orders / deliveries are made on the exact quantity of the schedule lines everything works fine. It is also ok when there are two successive delivery orders with a cumulative quantity that matches exactly the forecast line. As soon as a over-delivery is made, everything turns upside-down: older delivered schedule lines appear again in planning as if nothing was delivered until now...
I suspect that the problem is related to the fact that the whole process is manual and updating the cumulative received quantity is not the only parameter that is counting... is it so? Or the forecast delivery schedule has to be respected 100% in terms of quantities and timing?
I would really appreciate your help.
Regards,
H.