Indeed if an item has been deleted and it still exists on an active Receipt, this will cause an integrity error. To make the error go away, you have to either remove the receipt detail or add the item number back. And of course, adding back the item is likely not the desired solution.

Can't remove the receipt detail. It's not allowed. I put back the deleted item and yes it let me completed the order. But now I have a negative quantity showing in IC as Qty on PO. Any more suggestion? I did a DIC but problem not solved.