Solution : https://service.sap.com/sap/support/notes/305975 (SAP Service marketplace login required)
Key words :
additional key words, prerequisites solution implement, attached advance corrections, sap message classes, message class, transaction ggb0, letter 'z', prefix /xxx/, customer namespace, program rgugbr28
Related Notes :
| 366705 | Message class ready for input in validation header |
| 29509 | Error message GG756 "A system error occurred" |
| 6975 | Validierung/Substitution/rules - utility reports |