Sree,
The PO field is only reference test filed for us in SO.
??? I didn't mention anything about a PO. POs are not relevant for your ATP check for deliveries.
if the supply elements are disappearing means what i am thinking
In your solution, the only supply elements are Subcontractor Requirements and Returns Deliveries; plus whatever types of stock you have included. It is not clear to me what business requirement you have that should consider Subcontractor Requirements as a Supply element, but this is contained in your config.
So, supply elements 'disappearing' would mean
1. ATP-relevant Stock was reduced without offsetting ATP doc reduction,
2. Returns Delivery was reduced without offsetting stock increase, or
3. Subcontractor requirement was reduced without offsetting stock increase.
You should easily be able to check 1 in MB51. You can check number 2 by reviewing all recent Returns Deliveries. You can check number 3 by reviewing any recent Subcon docs.
Best Regards,
DB49