• SAP UPDATE TASK中不能使用COMMIT ROLLBACK语句
• 判断代码是否处于UPDATE TASK中可用FM：TH_IN_UPDATE_TASK
• 示例

DATA in_update_task TYPE sy-subrc.

CALL FUNCTION 'TH_IN_UPDATE_TASK'
  IMPORTING
    in_update_task = in_update_task.

CASE in_update_task.
  WHEN '0'.
    WRITE: 'not in update task'.
  WHEN '1'.
    WRITE: 'in update task'.
  WHEN OTHERS.
ENDCASE.

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