I've returned to my favourite topic 
After much clean-up and retest I have discovered that not my DEP:CONRl do indeed now downdate the ATP Quantity figure but only AFTER I run the Deployment BOP. This is in contrast to Sales Orders which downdate the ATP Quantity as they arrive in APO. This is the extra step I need to achieve for DEP:CONRl orders. Any pointers would be gratefully received.
Thanks
Andy