References for a preliminary ruling under Article 267 of TFEU: substantive aspects | Practical Law
A note on the substantive aspects of a reference from a national court or tribunal of an EU member state for a preliminary ruling by the Court of Justice of the European Union (CJEU) under Article 267 of the Treaty on the Functioning of the European Union (TFEU). The note covers the purpose of preliminary rulings, the national courts and tribunals that may refer questions and if and when a national court should or must make a reference.