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Need number to increment in recordset based on criteria

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I have been struggling for 2 weeks now with an incrementing problem.
If you add a raceNo once then the lapno =1. If same number is added again, then the lapno should be 2 etc etc
I use A2007 but attachment is saved as A2003.
I would prefer to filter the strwhere in code on "RaceName" and "RaceNo" and exclude dates.
RaceName = textfieldtype ; Racenumber =number ; RaceDate =long date; LapNo=number type
I have attached part of the application with the tables/forms i use, if anybody can assist please?

Code:

Dim varRet As Variant
Dim MyDB As DAO.Database
Dim rst2 As DAO.Recordset

Dim strWhere As String
Dim intLapNum As Integer

If IsNull(Me![strInput1]) Then Exit Sub

Set MyDB = CurrentDb
Set rst2 = MyDB.OpenRecordset("RaceEntry2", dbOpenDynaset, dbAppendOnly)
 

'Let's find the Lap Number based on the Race Date, Race Name, and Race Number
'strWhere = "[RaceDate] = #" & [Forms]![frmXCTiming]![RaceDate] & "# AND " & _
          "[RaceName] = '" & Forms![frmXCTiming]![RaceName] & "' AND [RaceNumber] = " & _
            varRet(0) -    THE RACENAME HAS A PROBLEM  _ TEMPORARILY REMOVED
strWhere = "[RaceDate] = #" & [Forms]![frmXCTiming]![Racedate] & "# AND [RaceNo] = " & _
            Me.strInput1
intLapNum = Nz(DMax("[LapNo]", "RaceEntry2", strWhere), 0)

 
With rst2
      .AddNew
 ![Racename] = Forms![frmXCTiming]![Racename]
        ![RaceNo] = Me.strInput1
        ![FinishTime] = Format(Now(), "General Date")
        ![Racedate] = [Forms]![frmXCTiming]![Racedate]
        ![Lapno] = IIf(intLapNum = 0, 1, intLapNum + 1)
        .Fields("Lap" & CStr(intLapNum + 1)) = Format(Now(), "General Date")
     
      .Update
    End With
  rst2.Close
 Set rst2 = Nothing
 
Me.strInput1.Value = ""

'Me.Requery

[Forms]![frmXCTiming]![RaceEntry2SF].Requery
 
With Me
  ![Text1].SetFocus        'Can use any Control
  ![strInput1].SetFocus
End With


Attached Files
File Type: zip RacetimeTest2003.zip (34.6 KB)

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