legality of an act

A reference for a preliminary ruling may also seek review of the legality of an act of Union law.

The legality of an act must be determined on the basis of the law of the country where the act is carried out.

In the event that a member State court is reviewing the application or interpretation of the Treaty or determining the legality of an act, directive, regulation or decision of the Common Market, it may request the Court's opinion on the matter.