Solution : https://service.sap.com/sap/support/notes/513074 (SAP Service marketplace login required)
Key words :
receive error message m8008 'error, account assignment category 'u', unplanned external service provisions, transaction 'display invoice document', transaction 'park invoice', terms parking reason, service entry sheet, program error, invoice document, 'display/change'
Related Notes :
| 449277 | M8008: SYSTEM ERROR: error in routine MRM_DRSEG_CR_CREATE |
| 393431 | MIRO - Vendor |