I've done billing (F1) for this a/c document is generated and cancelled it (s1) - but when i saved it accounting document is not generated automatically -status of cancelled document is still -OPEN .
But again i created a new billing document for which a/c document is generated.
My question is:
1. what setting we need to do so that a/c document is automatically generated for cancelled invoice.
2. How to prevent subsequent creation of billing document - when status of cancelled invoice is still OPEN.