tRFC calls which transfer IDocs use the function module IDOC_INBOUND_ASYNCHRONOUS at reception (before release 4.0: INBOUND_IDOC_PROCESS).
If an IDoc in the sending system has been passed to tRFC (IDoc status "03"), but has not yet been input in the receiving system, this means that the tRFC call has not yet been executed.
To check the status of the tRFC calls, choose Tools ® IDoc Interface/ALE ® Administration ® Monitoring ® Troubleshooting ® RFC Queue (SM58) and specify any additional selection criteria.
The program RSARFCEX restarts unsuccessful tRFC calls.
You cannot choose the option is being executed in background processing.