why is same billing document number generated for both commercial invoice and credit memo? Output type for commercial invoice is ZD04 and that of credit memo is ZD03 but when we went to vf03 to view the billing document xxxxxxxxx the system showing 2 doc output type ZD04 & ZD03, instead of ZD04 alone since there are different doc # for regular invoice # & credit / debit doc # Can anybody please help it?