Here is the sample code. I assumed that amount is not zero.
VBELN - Order
KSTAR - Cost element
TARG - Target
AMUNT - Amount
loop at lt_data into ls_data.
ls_data2 = ls_data.
append ls_data2 to lt_data2.
at end of kstar.
sum.
if ls_data-kstar = 601125 and ls_data-amunt <> ls_data2-amunt.
append ls_data to lt_data2.
endif.
endat.
endloop.
lt_data[] = lt_data2[].
loop at lt_data2 assigning <fs_data> where kstar = 601125.
read table lt_data into ls_data
index sy-tabix + 1.
if sy-subrc = 0.
if ls_data-vbeln = <fs_data>-vbeln and ls_data-kstar = <fs_data>-kstar.
ls_data2 = <fs_data>.
clear <fs_data>-targ.
else.
<fs_data>-targ = ls_data2-targ.
endif.
endif.
endloop.
Do you want to have this only for some specific Cost element? If not then just delete the code where you see 601125.
-Chandra