Solution : https://service.sap.com/sap/support/notes/1583266 (SAP Service marketplace login required)
Key words :
/saphelp_nwpi711/helpdata/en/dc/c5223d78cb752de10000000a114084/frameset, /saphelp_nwpi711/helpdata/en/48/aeb19e5bb5356be10000000a421937/frameset, terms sap exchange infrastructure, section 'technical outbound channels', outbound status 'message scheduled, rwb 'message monitoring', relevant individual status, individual status 'recorded, change affects messages, message overview application
Related Notes :
| 1599942 | Message overview: Messages remain in status "Scheduled" |