Problem with modify command....

Hi abapers,
loop at itab.
read table ifinal with key kunnr = itab-kunnr.
if sy-subrc = 0.
move: ifinal-dmbtr to itab-dmbtr.
modify itab index sy-tabix.
endif.
endloop.
Now the problem is that when i am using modify index sy-tabix it creating an additional entry
and when i am using only modify itab its working fine so wat could be the reason that modify index sy-tabix is
not working propertly.
Thanks

Hi Aarif,
I am assuming there is one-to-one relationship between itab and ifinal.
Try using following code.
sort itab by kunnr.
sort ifinal by kunnr.
data: l_index like sy-tabix.
l_index = 1.
loop at itab.
loop at ifinal from l_index.
     if ifinal-kunnr eq itab-kunnr.
        move: ifinal-dmbtr to itab-dmbtr.
    elseif ifinal-kunnr gt itab-kunnr.
       move sy-tabix to l_index.
       exit.
   endif.
endloop.
modify itab transporting dmbtr.
endloop.
Regards,
Anil Salekar

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