 Even if the doctrine of interjurisdictional immunity is properly available, the level of the intrusion on the core of the power of the other level of government must be considered.To trigger the application of the immunity, it is not enough for the provincial legislation simply to affect that which makes a federal subject or object of rights specifically of federal jurisdiction.The difference between "affects" and "impairs" is that the former does not imply any adverse consequence whereas the latter does.