59Similarly, a measure which would be just as effective and less restrictive than the requirement for a work permit at issue in the main proceedings would be an obligation imposed on a service-providing undertaking to report beforehand to the Netherlands authorities the presence of one or more posted workers, the anticipated duration of their presence and the provision or provisions of services justifying the posting. It would enable those authorities to monitor compliance with Netherlands social legislation during the posting, while taking account of the obligations to which that undertaking is already subject under the social legislation applicable in the Member State of origin (see judgments in Commission v Luxembourg, EU:C:2004:655, paragraph 31, and Commission v Germany, EU:C:2006:49, paragraph 45). Combined with the particulars provided by that undertaking relating to the situation of the workers concerned, referred to in paragraph 57 above, such an obligation would enable those authorities, where appropriate, to take the appropriate measures at the end of the expected period of posting.
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