描述：某些单据进行修改时，需要锁定数据

方法步骤：

1、se11：可copy创建新锁 EZSDDH

2、输入需要锁定的主表，锁参数会根据主键自动补填

3、激活后，会生成对应的锁函数

ENQUEUE_EZSDDH ：锁定表

DEQUEUE_EZSDDH：解锁表

4、代码使用如下：

FORM frm_lock  USING    p_mode
                        p_bukrs
                        p_zsddh.

  IF p_mode = 'L'.      "LOCK

    CALL FUNCTION 'ENQUEUE_EZSDDH'
      EXPORTING
        mode_ztyddh    = 'E'
        mandt          = sy-mandt
        zsddh          = p_zsddh
        bukrs          = p_bukrs
      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.

  ELSEIF p_mode = 'U'.  "UNLOCK

    CALL FUNCTION 'DEQUEUE_EZSDDH'
      EXPORTING
        mode_ztyddh = 'E'
        mandt       = sy-mandt
        zsddh       = p_zsddh
        bukrs       = p_bukrs.

  ENDIF.

ENDFORM.