97 to 2000 changes

[Lysy]

I have the follwoing simple code on a form:
Private Sub Replacement_Order_AfterUpdate()
If Replacement_Order.Value = True Then
Me.Repl_SAP.Visible = True
End If
If Replacement_Order.Value = False Then
Me.Repl_SAP.Visible = False
End If
End Sub
Under 97 it was ruuning fine - then I converted the mdb to
2000 and now I get error: Procedure declaration does not
match description of event of the same name"
Help - please..