28It is also settled case-law that the need to provide an interpretation of European Union law which will be of use to the national court makes it necessary for that court to define the factual and legal context of the questions it is asking or, at the very least, to explain the factual circumstances on which those questions are based. The order for reference must also set out the precise reasons why the national court is unsure as to the interpretation of European Union law and considers it necessary to refer a question to the Court for a preliminary ruling (Case C-42/07 Liga Portuguesa de Futebol Profissional and Bwin International [2009] ECR I-7633, paragraph 40).
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