Solution : https://service.sap.com/sap/support/notes/326125 (SAP Service marketplace login required)
Key words :
field selection reference key, standard item purchase order, enjoy purchase order, field selection keys, enjoy purchase requisition, required entry field, longer input-ready, item-related keys, document type level, single-screen transactions
Related Notes :
| 493318 | FAQ: Purchase requisition (ME51N, ME52N, ME53N) |
| 491789 | FAQ: Purchase order (ME21N, ME22N, ME23N) |