9In this regard, it must be stated first of all that in the absence of harmonization of the conditions of access to a particular occupation the Member States are entitled to lay down the knowledge and qualifications needed in order to pursue it and to require the production of a diploma certifying that the holder has the relevant knowledge and qualifications (see the judgment in Case 222/86 Union Nationale des Entraîneurs et Cadres Techniques Professionnels du Football (Unectef) v Heylens and Others [1987] ECR 4097, paragraph 10).
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