While the deadline to transpose the Directive expired on 17 July 2021, the four Member States listed above still have not communicated all their national measures, despite the letters of formal notice sent to them by the Commission in September 2021, and the reasoned opinions sent to these Member States between April and June 2022. As guardian of the Treaties, the Commission has to watch over the full and correct transposition of EU law into national legislation, hence the decision today to refer them to the Court of Justice of the EU.