Solution : https://service.sap.com/sap/support/notes/75408 (SAP Service marketplace login required)
Key words :
edit -> create element -> template/entry, 'schedule line number' field, message m8252 'parked document &, additional key words, abap/4 dictionary characteristics, change screens sapmm08r 0505, parked document, required entry, error message 00055, input field
Related Notes :
| 97831 | MR08/MR44:POrder w.accnt assigmnt,G/L accnt changed |
| 66706 | MR08/MR44 with order ref., acct assignmnt changable |