Solution : https://service.sap.com/sap/support/notes/822087 (SAP Service marketplace login required)
Key words :
system issues error messages, system issues messages, account assignment level, error message, program error, purchase order, affected items, schedule line, message log, terms cl_message_handler_mm
Related Notes :
| 855829 | EXIT_SAPMM06E_012: System message is not deleted (III) |
| 763605 | EXIT_SAPMM06E_012: System message is not deleted |