Solution : https://service.sap.com/sap/support/notes/827660 (SAP Service marketplace login required)
Key words :
locked purchase order item, locked purchase order items, gr/ir rows, original line items, purchase orders, commitment item, commitment items, terms rffms181, rffms183 reason, changed rffms181
Related Notes :
806595 | Purchase order commitment items for old invoices |
532333 | Reorganization of commitment items in original documents |