Total Amount Spend (ekbe-dmbtr) on Material & Vendor

Question

Hi,
In My first ITAB, I have a list of Material & It's related Vendor
Like,
Material      Vendor
MM1             ABC
MM2            ABC
MM2           XYZ
MM3            MNO
In my next ITAB I need to find Total Amount Spend for this Material on It's Vendors.
(From - MIGO i.e. table EKBE )
I try to do this with following code -
IF it_comb IS NOT INITIAL.
    LOOP AT it_comb INTO wa_comb.
   SELECT a~matnr c~lifnr SUM( b~menge ) SUM( b~dmbtr )
        INTO CORRESPONDING FIELDS OF it_pssum
        FROM ekbe AS b INNER JOIN ekpo AS a ON a~ebeln = b~ebeln AND a~ebelp = b~ebelp
                                    INNER JOIN ekko AS c ON c~ebeln = a~ebeln
       WHERE a~matnr = wa_comb-matnr
        AND c~lifnr = wa_comb-lifnr
        AND b~bwart EQ '101'
        GROUP BY a~matnr c~lifnr.
      ENDSELECT.
     endloop.
     endif.
Here First ITAB is it_comb.
When I debugg - The Values are correct in IT_COMB and IT_PSSUM - matnr & lifnr but it's not fetching Values for  IT_PSSUM - menge & dmbtr.

Answer 1

Thank You All.
@Medha & NabheetMadan
Yes, I know it's not a good practice. But in PO table I have more than 10 Lac Records.
And If I take Loop Inside the Loop it's taking Lots of Time (going it Time Out ), Also if I use FOR ALL ENTRIES IN - Because I need to take all Records and it's Total on MATNR & LIFNR.
@ Vinod
I try it with
SELECT a~matnr c~lifnr SUM( b~menge ) AS menge SUM( b~dmbtr ) AS dmbtr
it's working. Thanks.
Yeah.. I know it's not in proper Index, but I need to do - Because I want to Work On EKBE values On Each Material & Vendor Combination.