Withholding tax based on segments/profit center

Question

Hello Friends
Iam developing withholding tax report for our FI module.I need to show report based on segments which are our different company offices.Now WITH_ITEM table does not has segment otherwise I would have directly picked data from WITH-ITEM. .Iam using this complex logic,which I have a feeling is not the right way and is taking lot of time to run.
My report logic  is as follows:
First I pick from BKPF those documents which are vendor payments.
SELECT * INTO CORRESPONDING FIELDS OF TABLE ibkpf
         FROM bkpf
         WHERE bukrs =  p_bukrs
           AND gjahr =  p_gjahr
           AND belnr IN s_belnr
           AND blart IN ('KZ')
           AND budat IN s_budat.
Next I find the invoice number against that payment number.
LOOP AT ibkpf.
  SELECT SINGLE belnr FROM BSak
                        INTO v_belnr
                        WHERE bukrs =  p_bukrs
                          AND gjahr =  p_gjahr
                          AND augbl = ibkpf-belnr
                          AND BLART = 'KR'.
Then I get the segment against that invoice and remove from internal table those values whose segment is different.
    SELECT SINGLE segment FROM bsis
                     INTO v_segment
                      WHERE bukrs =  p_bukrs
                        AND gjahr =  p_gjahr
                        AND belnr = v_belnr
                       AND segment = p_seg.
IF sy-subrc NE 0.
      DELETE ibkpf.
   ENDIF.
  ENDLOOP.
Now getting from with_iem data against the remaining document numbers.
SELECT * FROM with_item FOR ALL ENTRIES IN ibkpf
     WHERE bukrs     = p_bukrs
       AND belnr     = ibkpf-belnr
       AND gjahr     = p_gjahr
       AND wt_acco   IN s_lifnr
       AND wt_withcd IN s_taxc
       AND witht     IN S_WITHT.
If some one has experience in withholding tax reports,he can check my code and suggest some other logic as our data base is not too heavy at this time still report is very slow.
Thank you

Answer 1

Hi Nouman,
For performance related issue,please select only required entries because use of *SELECT ** will degrade its performance.
Make a structure and avoid using CORRESPONDING FIELDS OF .
Regards,
Praveen