Hi DB49,
The PO field is only reference test filed for us in SO. if the supply elements are disappearing means what i am thinking if there is any delay in the PO or the stock is consumed by other delivery. But in this case also delivery is passing through ATP so it should not be a problem its my thought only (I could also be wrong).
I am thinking about your second suggestion about custom logic which could by pass the standard SAP process. I will check with my abaper and come back here.
Thank you Guru DB49 for your response.
Regards,
Sree.