Solution : https://service.sap.com/sap/support/notes/589371 (SAP Service marketplace login required)
Key words : 
system displays message m8496, transaction 'add incoming invoice', 'noticed' status due, terms mir7 reason, attached correction instructions, support package sapkh46c31, message log, support package, invoice document, 'invoice document
Related Notes : 
       
| 582059 | BAdI: No consideration of system messages | 
| 497123 | MIR4, MIR7: Error messages in the parking |