Solution : https://service.sap.com/sap/support/notes/409677 (SAP Service marketplace login required)
Key words :
program run checks user action abap/4 program submit authorization level, additional key words web reporting, abap/4-program amon, rfc-access activity execution, transaction pfcg --> authorizations, users authorization profile, s_rfc authorization check, message 'rfc unable, return data' appears, internet-service clpamon
Related Notes :
387031 | Report AMON_GET_ALERT_LIST is not released for the Internet |
373347 | Authorizations for WEB Reporting |
210785 | Web release of reports, queries (MiniALV, MidiALV) |