Hi DB49,
I understand... Could you just then instead give me a hint on where (enhancement spot) to unflag Availability Check (T459K-ATPPR) before calling ATP? I was trying to debug SAPMV45A @ T459K read, but it's empty. that's the only chance I can totally SKIP ATP check w/o changing confirmed or unconfirmed items. PLEAAAAASE... just that alone would really help a lot! 
thanks and regards,
Zeek