Solution : https://service.sap.com/sap/support/notes/315676 (SAP Service marketplace login required)
Key words :
additional key words me21n, f8 button 'make change', account assignment type column, entering purchase order items, remaining purchase order items, account assignment type enter, purchase order items, 'fast change' button, account assignment type, purchase order item
Related Notes :
496082 | FAQ: Account assignment in purchasing |
201895 | ME21N: Repeat account assignment is not possible |