23As regards the competent institutions of the Member State to which workers are posted, it is clear from the obligations to cooperate arising from Article 10 EC that those 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 (FTS, paragraph 52).
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