Sub Worksheet_Change(ByVal Target As Range)
On Error GoTo Fin: If Target.Count > 1 Then Exit Sub
If Not Intersect(Target, [L:L]) Is Nothing Then
Application.ScreenUpdating = False
If LCase(Target) = "x" Then
Cells(Target.Row, "M") = ""
End If
End If
If Not Intersect(Target, [M:M]) Is Nothing Then
Application.ScreenUpdating = False
If LCase(Target) = "x" Then
Cells(Target.Row, "L") = ""
End If
End If
Fin:
Application.ScreenUpdating = True
End Sub