52As regards the competent institutions of the Member State to which workers are posted, it is clear from the obligations to cooperate arising from Article 5 of the Treaty that these obligations would not be fulfilled — and the aims of Article 14(1)(a) of Regulation No 1408/71 and Article 11(1)(a) of Regulation No 574/72 would be thwarted — if the institutions of that Member State were to consider that they were not bound by the certificate and also made those workers subject to their own social security system.
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