Solution : https://service.sap.com/sap/support/notes/507808 (SAP Service marketplace login required)
Key words :
trusted/trusting connection, asynchronous rfcis turned, transaction sy-tcode, enable asynchronous rfc, start remote transaction, asynchronous rfc, remote system, synronous rfc, synchronous rfc, start transactions
Related Notes :
| 49730 | Error message: Screen output without connection to user |