Solution : https://service.sap.com/sap/support/notes/457403 (SAP Service marketplace login required)
Key words :
additional key words me21n, displays message 06218 'net price, avoid side effects, transaction me21n, purchase order, transaction me22n, created item, item overview, ekpo-netpr, problem occurs
Related Notes :
| 427908 | ME21N NAVM rec. value from NAVS after chang. mat. grp./cond. |