Dispatching IDocs

In the communication layer, the IDoc is dispatched with a transactional remote function call (tRFC) or through another file interface (EDI, for example).

The transactional call is not executed immediately; instead, the data to send is first written to a database table. When a COMMIT WORK is triggered in the calling program, the remote call to the receiver system is executed. If the receiver system is currently unavailable, a periodically scheduled background process tries to send the data to the receiver system again later. The tRFC guarantees that the data is only transmitted once. tRFC guarantees that the data is transferred once only.