39It is clear from the obligations to cooperate arising from Article 5 of the Treaty that those obligations would not be fulfilled — and the aims of Article 14a(1)(a) of Regulation No 1408/71 and Article 11(a) of Regulation No 574/72 would be thwarted — if the competent institution of the Member State in which the work assignment is carried out were to consider that it was not bound by the certificate and made the self-employed person subject to its own social security system (Fitzwilliam Executive Search, paragraph 52).
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