Problem in modifying the main internal table gt_data

Question

Hello i have written code for modifying the main internal table. i have read data from ausp table and put into the internal table gt_ausp. now i want to modify my main table GT-DATA with gt_ausp. i am not able to do this.
LOOP AT gt_data  INTO ls_list.
    lt_temp-objek  =  ls_list-matnr.
    APPEND  lt_temp.                  " 특성값 발췌용도로 저장
    APPEND  ls_list  TO lt_work.      " 핵심작업용도로 저장
  ENDLOOP.
  DESCRIBE TABLE lt_temp.
  IF  sy-tfill  EQ  0.
    pv_flg  =  'X'.
    EXIT.
  ENDIF.
Get 제품인증(플랜트별).....
  DESCRIBE TABLE lt_cetino_tp.
        플랜트          자재번호
        카타로그-인증   코드그룹-인증   인증코드
        Certi. No.
Get 자재별 특성값..........
          오브젝트  특성이름  내부특성   내부카운터  특성값
  SELECT    aobjek    batnam   aatinn    aatzhl    a~atwrt
        INTO CORRESPONDING FIELDS OF TABLE  lt_ausp_tp
        FROM ausp AS a  INNER JOIN  cabn AS b
          ON aatinn  =  batinn
         FOR ALL ENTRIES IN  lt_temp
       WHERE a~objek  EQ  lt_temp-objek   " 오브젝트키(자재번호)
         AND a~klart  EQ  '001'           " 클래스유형
       AND a~atzhl  EQ  '001'           " 특성값카운터(최종건만 존재)
                                          자재특성 변경시 변경됨
         AND b~adzhl  EQ  '0000'.
  IF  sy-subrc  EQ  0.
    DELETE ADJACENT DUPLICATES FROM  lt_ausp_tp.
    lt_ausp[]     =  lt_ausp_tp[].
    lt_ausp_tp2[] =  lt_ausp_tp[].
    DELETE ADJACENT DUPLICATES FROM  lt_ausp_tp2.
  Get 특성내역
          내부특성   " 내부카운터
          특성값       특성값내역
    SELECT    aatinn  " aatzhl
              aatwrt    batwtb
          INTO CORRESPONDING FIELDS OF TABLE  lt_cawn
          FROM cawn AS a  INNER JOIN  cawnt AS b
            ON aatinn  =  batinn  AND
               aatzhl  =  batzhl  AND
               aadzhl  =  badzhl
           FOR ALL ENTRIES IN  lt_ausp_tp2
         WHERE a~atinn  EQ  lt_ausp_tp2-atinn  " 내부특성
           AND b~spras  EQ  sy-langu.
  ENDIF.
  SORT  lt_work BY matnr .
  BREAK-POINT.
  LOOP AT lt_work  INTO ls_list.
  특성내역
    READ TABLE  lt_ausp  WITH TABLE KEY  objek = ls_list-matnr
                                         atnam = 'SECTION_WIDTH'.
  수출자재가 아닌 것은 제외
LS_LIST-SECTION_WIDTH = LT_AUSP-ATWRT.
MODIFY TABLE GT_DATA FROM LS_LIST  TRANSPORTING SECTION_WIDTH.

Answer 1

Hi,
Question before: why dont you just use the std.API for reading the classification data?
e.g. "BAPI_OBJCL_GETDETAIL"
Second: a DELETE DELETE ADJACENT DUPLICATES works only only sorted tables.
Doing this after a select will only succeed randomly depending on the buffers of your data based below.
( 90% chance if it is an oracle system)
To your question:
Just replace your LOOP AT gt_data into ls_list
by a LOOP AT gt_data ASSIGNING <current_list_record>.
then you can access the fields directly:
<current_list_record>-SECTION_WIDTH = LT_AUSP-ATWRT.
Cause of your issue:
"MODIFY" needs a key to to find the record to be updated.
If your gt_data ist referencing a DDIC table type with a key or a local type with a key
it has no chance to do it.
Hope that helps.
br,