According to the precedence principle, European law is superior to the national laws of Member States. The precedence principle applies to all European acts with a binding force. Therefore, Member States may not apply a national rule which contradicts to European law.
The precedence principle guarantees the superiority of European law over national laws. It is a fundamental principle of European law. As with the direct effect principle, it is not inscribed in the Treaties, but has been enshrined by the Court of Justice of the European Union (CJEU).
Source eur-lex.europa.eu
