Message Data Transfer 
The transfer of messages to external functions is carried out via transactional remote function call (tRFC) as program-to-program communication. The tRFC ensures that each call is carried out only once. The sequence of the calls is not changed. If the target system is not active when the call takes place, the RFC is repeated according to a repetition rate or duration that can be defined by the user.
The execution of a tRFC is documented in a log which you can access from the message monitor: see Displaying Transactional RFC Logs for Messages .
For information on how to access the message monitor, see Accessing the Message Monitor .
See also: