Tamer,
1. Please elaborate in detail on your method of delivery creation. Are you using Service Parts Management with auto delivery creation? Are all your availability checks being done in ECC?
2. Why have you elected to ignore other STO requirements in your ATP scope of check configuration? Also, are there no Purchase Req requirements that must be considered?
3. Please show a screen shot of the scope of check for Deliveries.
Best Regards,
DB49