Solution : https://service.sap.com/sap/support/notes/750877 (SAP Service marketplace login required)
Key words :
arbitrary program id, unique program id, rfc_prefix name2 sapftp, back rfc destination, back destination, rfc_prefix fixed, saphttp/sapftp, rfc server, rfc servers, retrieve data
Related Notes :
| 752674 | Prefix for program-ID for start via BACK-destination |