CHECK_47 - RFC call error handling

Add EXCEPTIONS including MESSAGE, this will make it easier to debug in the future in case the call fails.

    EXCEPTIONS
      system_failure        = 1 MESSAGE lv_msg
      communication_failure = 2 MESSAGE lv_msg
      resource_failure      = 3.

https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abenrfc_exception.htm

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