In 1899, Lord Watson asserted during the argument in "CPR v Bonsecours" that neither the federal parliament nor the provincial legislatures could give legislative authority to the other level. Subsequent attempts to dovetail federal and provincial legislation to achieve certain ends met with difficulty, such as an attempt by Saskatchewan to ensure enforcement of a federal statute by enacting a complementary Act declaring that the federal Act would continue in force under provincial authority if it was ruled "ultra vires". The Saskatchewan Court of Appeal ruled a federal and provincial Act "ultra vires", voiding both as an attempt by the province to vest powers in parliament unauthorized by the "BNA Act".