=SUM(IF(IF(MATCH(Table1[Ivoice],Table1[Ivoice],0)=ROW(Table1[Ivoice])-ROW(Table1[[#Headers],[Ivoice]]),(ROW(Table1[Ivoice])-ROW(Table1[[#Headers],[Ivoice]])),0)<>0,Table1[Totals],""))
Can someone break it down and explain the meaning behind the inputs please? What does the ROW function do in...