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[blue]Private Sub Form_Error(DataErr As Integer, Response As Integer)
If DataErr = 2279 Then
MsgBox "[purple][b]Your Message Here![/b][/purple]"
Me("[purple][b]YourTextboxName[/b][/purple]") = Null
DoCmd.OpenForm "[purple][b]FormName[/b][/purple]"
End If
End Sub[/blue]