0fi_gl_4 enhancement

Question

Hi Experts,
I tried to enhance GL extractor. But once done, the FI doc number (BKPF -BELNR) is replaced by RBKP- BELNR. Not really able to figure out whats wrong in the code..
I am attaching the code...Can anyone please help..very urgent..
(Coding done based on suggestions by Olivier Cora in one other threads...Many thanks to him).
WHEN '0FI_GL_4'. " General Ledger
    LOOP AT c_t_data INTO ls_figl_4.
      lv_idx = sy-tabix.
      SELECT SINGLE awkey INTO l_awkey
      FROM bkpf
      WHERE belnr = ls_figl_4-belnr
        AND gjahr = ls_figl_4-gjahr
        AND bukrs = ls_figl_4-bukrs.
      IF sy-subrc = 0.
        l_awkey = l_awkey(10).
        SELECT SINGLE rmwwr wmwst1 belnr gjahr
        INTO (ls_figl_4-zzgrossamt, ls_figl_4-zztaxamt, ls_figl_4-belnr, ls_figl_4-gjahr)
        FROM rbkp
        WHERE belnr = l_awkey.
        IF sy-subrc EQ 0.
          MODIFY c_t_data FROM ls_figl_4 INDEX lv_idx.
       ENDIF.
       IF sy-subrc = 0.
          SELECT SINGLE mwskz wrbtr ebeln
          INTO (ls_figl_4-zztaxcode, ls_figl_4-zznetamt, ls_figl_4-zzebeln)
          FROM rseg
            WHERE gjahr = ls_figl_4-gjahr
            AND belnr = ls_figl_4-belnr
            AND bukrs = ls_figl_4-bukrs.
          IF sy-subrc EQ 0.
            MODIFY c_t_data FROM ls_figl_4 INDEX lv_idx.
          ENDIF.
        ENDIF.
      ENDIF.
    ENDLOOP.

Answer 1

Hi,
The reason seems to be this section in your programming:
SELECT SINGLE rmwwr wmwst1 belnr gjahr
INTO (ls_figl_4-zzgrossamt, ls_figl_4-zztaxamt, ls_figl_4-belnr, ls_figl_4-gjahr)
FROM rbkp
WHERE belnr = l_awkey.
IF sy-subrc EQ 0.
MODIFY c_t_data FROM ls_figl_4 INDEX lv_idx.
As far as I can see you are overwriting with rbkp-belnr, since you use ls_figl_4-belnr. Your modify with "modify" c_t_data-belnr (bkpf) with ls-figl_4-belnr. you need to call your new belnr something else, like zbelnr.
Another thing: you dont need to write any coding for selecting field values from BKPF, since the extractor is already selecting from this table (standard). You just need to make an append structure on the extract structure with the fields from BKPF table you need. I don't know about the other tables you are using, but if you make an append stucture you just include the other fields too. Then you run the extractor from tcode RSA3 and check if the new fields are filled with the right values. If so - you don't need to do programming at all.
Performancewise it is furthermore much better to do look-ups on the BW-side instead of using a functional exit on the extractor. So if you already have the other data in BW in e.g. and ODS, then its much faster to make the look up against this -due to the fact that a R/3 system is setup to handle many small transactions (small amount on data in each transaction) where as a BW system is set-up to handle a few big transactions (large amount of data in each transaction). 
I hope this answers your question.
Best regards,
Keld