=Sum( {<BMITODAYYEAR2={"$(JaarTov)"},BMIDAYNR2={"=Num(Month(Today())) & Num(Day(Today()))"} >} BMITODAYBRUTO2 ) >} BMITODAYBRUTO2 )
I think, BMIDAYNR2={"=Num(Month(Today())) & Num(Day(Today()))"} this part is wrong.
Who knows the correct answer, her should BMIDAYNR2 equal mto mdd (monthnumber, daynumber)