For L = 1 To Range("B65500").End(xlUp).Row
If WorksheetFunction.IsNA(Cells(L, "B")) Then
MsgBox "Erreur N/A détectée en B" & L
End If
Next L
Private Sub Worksheet_Change(ByVal Target As Range)
If Application.IsNA(Target) = True Then MsgBox "Pas trouvé : cellule " & Target.Address
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, [B:B]) Is Nothing Then _
If Application.IsNA(Target) = True Then MsgBox "Pas trouvé : cellule " & Target.Address
End Sub