European Union – Equal treatment in employment. European Union law, in particular the principle of primacy of EU law, should be interpreted as precluding national legislation, such as that at issue in the main proceedings, under which a national body established by law in order to ensure enforcement of EU law in a particular area lacked jurisdiction to decide to disapply a rule of national law that was contrary to EU law. The Court of Justice of the European Union so held in proceedings concerning the jurisdiction of the Workplace Relations Commission (Ireland) to decide to disapply provisions of national law that were contrary to EU law.