Solution : https://service.sap.com/sap/support/notes/442771 (SAP Service marketplace login required)
Key words :
change purchase order items, warning message reason, attached correction instruction, mmcnt_context_pricing type mmpur_context, type group mmcnt, type group, display messages, price determination, terms me21n, program error
Related Notes :
| 402889 | ME21N: Checks for material |