Thanks, simple and I don't know why I didn't think of that *facepalms*
It is now working with this:
CumVal: FormatCurrency(DSum("[PV-PlannedTotalExpenditure]","qry_ProjectMonthlyPVCalc","[ProjectID]=" & [ProjID] & " And [Mth_Yr]<=" & [MthYr] & " And [Yr]=" & [BaselineYear] & ""))
Also it...