Message Number list used by SAP ABAP Function Module WLF_INVOICE_ITEM_DELETE (Belegposition löschen)
SAP ABAP Function Module WLF_INVOICE_ITEM_DELETE (Belegposition löschen) is using
# Object Type Object Name Object Description Note
     
1 Message Number  WS - 090 Items can no longer be deleted. Only cancellation possible
2 Message Number  WS - 834 Collective document items can only be cancelled not deleted