May be I've havente understund your problem but if the istuation is this a 100 10 b 50 30 c 20 40 d 10 20 Then sum c = 100*10+50*30+ 20*40+10*20 In this case not use the aggregate measure but the 'normal measure sum c = (100+50+20+10)*(10+30+40+20) In this case use the aggretagate measure with sun for group
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