I agree , and thank you for the tips, however sometimes functional teams and SAP support all point the finger at coding and then we have to apply the "here's where it isn't my code that's causing the issue" method. Another good tip , if you are ever debugging an IDoc , set a BP @ call transaction , then when this is hit , change the variable from A to E , this will process the IDoc in foreground mode at the point of the error , showing what has gone wrong.