sap abap 获取结构字段

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'

       EXPORTING

            i_structure_name = 'ZFIIC001'

       CHANGING

            ct_fieldcat      = p_gt_fieldcat[].

  loop at p_gt_fieldcat.

    if p_gt_fieldcat-fieldname = 'MCOD1'.

      p_gt_fieldcat-COLTEXT = '科目描述'.

    endif.

    if p_gt_fieldcat-fieldname = 'DMBTR'.

      p_gt_fieldcat-do_sum = 'X'.

    endif.

    if p_gt_fieldcat-fieldname = 'MENGE'.

      p_gt_fieldcat-do_sum = 'X'.

    endif.

    modify p_gt_fieldcat.

  endloop.