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程序單次只允許一次執行的SAP 鎖

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START-OF-SELECTION.
  CALL FUNCTION ENQUEUE_ESRDIRE
    EXPORTING
      name           = sy-repid
      _scope         = 1
    EXCEPTIONS
      foreign_lock   = 1
      system_failure = 2
      OTHERS         = 3.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4. ENDIF.

程序單次只允許一次執行的SAP 鎖