-> Invoice for 2200001/20 2011/10/11 Completed
-> Accounting Document 44000001 2011/10/11 Cleared
->Cancel. INV F. 23000001/20 2011/10/13 Completed
->Accounting Document 28000001 2011/10/13 Cleared
I bill a sales order related item and then I found there is a error.
and I canceled this billing and want to delete this sales order item.
the system shows error message which shows "already has subsequent document"
but I have already canceled the billing. why can't I deleted the sales order item 20?