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用这两个函数Function DYNP_VALUES_READ, DYNP_VALUES_UPDATE 
参考代码： 
MODULE ztmdno_dr_help INPUT. 
  DATA: 
    l_lifnr   TYPE ztmt018-lifnr, 
    l_zvehtab TYPE ztmt018-zvehtab, 
    l_zvehid  TYPE ztmt018-zvehid. 
 
  CLEAR: gt_dynfields,gh_dynfields,it_return[],it_ztmdno[],ih_ztmdno. 
 
  gh_dynfields-fieldname = 'PRE_DATA-LIFNR'. 
  APPEND gh_dynfields TO gt_dynfields. 
  CLEAR gh_dynfields. 
  gh_dynfields-fieldname = 'PRE_DATA-ZVEHTAB'. 
  APPEND gh_dynfields TO gt_dynfields. 
----------------------获取屏幕的值 
  CALL FUNCTION 'DYNP_VALUES_READ' 
    EXPORTING 
      dyname               = sy-repid 
      dynumb               = sy-dynnr 
      translate_to_upper   = 'X' 
    TABLES 
      dynpfields           = gt_dynfields 
    EXCEPTIONS 
      invalid_abapworkarea = 1 
      invalid_dynprofield  = 2 
      invalid_dynproname   = 3 
      invalid_dynpronummer = 4 
      invalid_request      = 5 
      no_fielddescription  = 6 
      invalid_parameter    = 7 
      undefind_error       = 8 
      double_conversion    = 9 
      stepl_not_found      = 10 
      OTHERS               = 11. 
  IF sy-subrc <> 0. 
    MESSAGE '函数DYNP_VALUES_READ，未能取值' TYPE 'E'. 
    EXIT. 
  ENDIF. 
  READ TABLE gt_dynfields INTO gh_dynfields WITH KEY fieldname = 'PRE_DATA-LIFNR'. 
  IF sy-subrc = 0. 
    l_lifnr = gh_dynfields-fieldvalue. 
  ENDIF. 
 
  READ TABLE gt_dynfields INTO gh_dynfields WITH KEY fieldname = 'PRE_DATA-ZVEHTAB'. 
  IF sy-subrc = 0. 
    IF gh_dynfields-fieldvalue IS INITIAL. 
      MESSAGE '请先输入车牌号' TYPE 'I'. 
      EXIT. 
    ENDIF. 
    l_zvehtab = gh_dynfields-fieldvalue. 
  ENDIF. 
 
  SELECT SINGLE zvehid 
    INTO l_zvehid 
    FROM ztmt018 
   WHERE lifnr = l_lifnr 
     AND zvehtab = l_zvehtab. 
 
  SELECT ztmdno 
         ztmdname 
         ztmmob 
         zvehid 
    INTO TABLE it_ztmdno 
    FROM ztmt025 
   WHERE zvehid = l_zvehid. 
  IF it_ztmdno[] IS NOT INITIAL. 
    CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST' 
      EXPORTING 
        retfield        = 'ZTMDNO_DR' 
        dynpprog        = sy-repid 
        dynpnr          = sy-dynnr 
        value_org       = 'S' 
      TABLES 
        value_tab       = it_ztmdno[] 
        return_tab      = it_return[] 
      EXCEPTIONS 
        parameter_error = 1 
        no_values_found = 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. 
 
    READ TABLE it_return INDEX 1. 
    IF sy-subrc = 0. 
      pre_data-ztmdno_dr = it_return-fieldval. 
      READ TABLE it_ztmdno INTO ih_ztmdno WITH KEY zvehid = l_zvehid. 
      IF sy-subrc = 0. 
        CLEAR gh_dynfields. 
        gh_dynfields-fieldname = 'PRE_DATA-ZTMDNAME_DR'. 
        gh_dynfields-fieldvalue = ih_ztmdno-ztmdname_dr. 
        APPEND gh_dynfields TO gt_dynfields. 
        CLEAR gh_dynfields. 
        gh_dynfields-fieldname = 'PRE_DATA-ZTMMOB'. 
        gh_dynfields-fieldvalue = ih_ztmdno-ztmmob. 
        APPEND gh_dynfields TO gt_dynfields. 
---------------------更新屏幕的值 
        CALL FUNCTION 'DYNP_VALUES_UPDATE' 
          EXPORTING 
            dyname               = sy-repid 
            dynumb               = sy-dynnr 
          TABLES 
            dynpfields           = gt_dynfields 
          EXCEPTIONS 
            invalid_abapworkarea = 1 
            invalid_dynprofield  = 2 
            invalid_dynproname   = 3 
            invalid_dynpronummer = 4 
            invalid_request      = 5 
            no_fielddescription  = 6 
            undefind_error       = 7 
            OTHERS               = 8. 
        IF sy-subrc <> 0. 
        ENDIF. 
      ENDIF. 
    ENDIF. 
  ENDIF. 
ENDMODULE.                 " ZTMDNO_DR_HELP  INPUT 
 
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