 In the absence of impairment, interjurisdictional immunity does not apply.It is only if the adverse impact of a law adopted by one level of government increases in severity from affecting to impairing that the core competence of the other level of government or the vital or essential part of an undertaking it duly constitutes is placed in jeopardy.According to the doctrine of federal paramountcy, if the operational effects of provincial legislation are incompatible with federal legislation, the federal legislation must prevail and the provincial legislation is rendered inoperative to the extent of the incompatibility.