SAP Message 1R555 - System error in RFC call of function module &1

Diagnosis
Calling function module &V1& by remote function call (RFC) triggeredthe exception SYSTEM_FAILURE. This happens if the recipient system hascrashed (that is, the target system of the call).

System Response
The function module was not executed.

Procedure
Repeat the operation that led to this error (after waiting a certainperiod of time, of necessary). If the error reoccurs, inform systemadministration.

Procedure for System Administration
Check the availability of the target systm of the RFC call. If thismesssage is in the application log, you may find more entries on RFCdestinations and relevant operating system error messages.