Dim strCriteria As String strCriteria = "Serial = " & Me.txtSerial & "" If DCount("Serial", "tblEquipment", strCriteria) > 0 Then Me.Undo MsgBox "Warning: Serial " & txtSerial & " already exists." & vbCr & vbCr & "You cannot enter duplicate serial numbers.", vbInformation, "Duplicate Information" Cancel = True End If End Sub
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