Solution : https://service.sap.com/sap/support/notes/807290 (SAP Service marketplace login required)
Key words :
transaction me21 works fine, system error messages me678, enjoy dialog me21n, case unit definitions, badi /afs/mm_round, unit handling rounding, program error, standard system, unit handling, /afs/mm_round
Related Notes :
| 982032 | PO create using BAPI or ME21N does not consider DECAN/ANDEC |
| 875951 | AFS: ME21N - Rounding in Purchase Order |
| 667114 | AFS: Rounding for a schedule line |
| 583676 | ME21N: Decimal places in the purchase order quantity |