As is the case every time a function module is called, when an RFC is made, the system field sy-subrc is initialized in the calling program, or set to the value that is specified in exception handling. Each of the following system calls is initialized in the calling program too:

initialized in the calling program.

If an error message or termination message is sent using statement Message while a remotely-called function module is being executed, exception SYSTEM_FAILURE is triggered in the calling program. You can assign a return value to this for the call. When exceptions occur, these system fields are supplied with the properties of the message.