The Court of Arbitration is competent exclusively to review regulations that have force of law. By regulations having force of law are meant both substantive and formal rules adopted by the federal parliament (statutes) and by the Councils of the Communities and regions (decrees and ordinances). All other regulations, such as Royal decrees, decrees of governments of Communities and Regions, ministerial decrees, regulations and decrees of provinces and municipalities, as well as court judgments fall outside the jurisdiction of the Court.