43Similarly, the Court has already held that Regulation No 987/2009 codified the Court’s case-law, affirming the binding nature of the E 101 certificate and the exclusive competence of the issuing institution to assess the validity of that certificate, and expressly reproducing the procedure as a means of resolving disputes concerning both the accuracy of documents drawn up by the competent institution of a Member State and the determination of the legislation applicable to the worker concerned (judgment of 27 April 2017, A-Rosa Flusschiff, C‑620/15, EU:C:2017:309, paragraph 59, and order of 24 October 2017, Belu Bienstleistung and Nikless, C‑474/16, not published, EU:C:2017:812, paragraph 19).
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