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Please help with DSum

Please help with DSum

Please help with DSum

(OP)
Hi

I am converting an access 2 database to an ADP and things are going ok until this.

I have the following as a control source

=DSum("Meetings","tStaffTimeAllowances","([StaffID] = cStaffID) And fnBetween((cRefDate),([StartDate]),(IIf(IsNull([EndDate]),'01/01/2050',[EndDate])),0)")/60

andd the fnBetwwen is this

Function fnBetween(TestDate As Variant, FirstDate As Variant, LastDate As Variant, NullReturn As Integer) As Integer
    Dim tDate As Variant
    Dim fDate As Variant
    Dim LDate As Variant
    If IsNull(TestDate) Then
        fnBetween = NullReturn
    Else
        tDate = CVDate(TestDate)
        fDate = CVDate(FirstDate)
        LDate = CVDate(LastDate)
        If tDate >= fDate And tDate <= LDate Then
            fnBetween = 1
        Else
            fnBetween = 0
        End If
    End If
End Function

Now how can i do this in a project?
As you can not use the function within the Dsum or so it seems.

I guess I need to use a SP but I really dont know where to start any help would be great

Cheers

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