29Thus, in order to ensure that a nucleus of mandatory rules for minimum protection are observed, the first subparagraph of Article 3(1) of Directive 96/71 provides that Member States are to ensure that, whatever the law applicable to the employment relationship, in the framework of the transnational provision of services, undertakings guarantee workers posted to their territory the terms and conditions of employment covering the matters listed in that provision (judgment in Laval un Partneri, EU:C:2007:809, paragraph 73).
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