SAP recommends using the qRFC inbound queue when:
The application wants to determine the time of processing of the inbound qRFC-LUW in the target system itself.
The transfer and execution (update) of the LUW are to be separated from each other.
Processing using the inbound queue is only possible when the target system is an SAP system.
The outbound queue of the send system is used to write the qRFC LUWs to the inbound queue of the target system.
LUWs arriving in the inbound queue are read in the target system and processed from the queue either by the QIN Scheduler, or from an individual application program.
You can find detailed information about programming the qRFC inbound queue under: