Judgment_paragraph 59 · A-Rosa Flussschiff GmbH v Union de recouvrement des cotisations de sécurité sociale et d’allocations familiales d’Alsace (Urssaf), venant aux droits de l’Urssaf du Bas-Rhin and Sozialversicherungsanstalt des Kantons Graubünden (C-620/15)

59Moreover, Regulation No 987/2009, currently in force, 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 called in question by the French Government and by the URSSAF as a means of resolving disputes concerning both the accuracy of documents drawn up by the competent institution of a Member State and determining the legislation applicable to the worker concerned.