Solution : https://service.sap.com/sap/support/notes/69492 (SAP Service marketplace login required)
Key words :
messages -> output control -> message schemas -> define message schemas, additional key words me21, message determination procedure, standard sap system, partner role 'ba', partner role 'lf', alternative transmission medium, <document> -> assign schema, partner role determination', field 'partner role'
Related Notes :
| 132657 | ME27: No messages to other partners possible |
| 120163 | Message to subcontractor for third-party SC order |
| 84286 | Incorrect vendor address for messages |
| 72190 | Messages and partners: Incorrect address in ME90 |