Judgment_paragraph 53 · 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)

53Indeed, given that the Court has determined, through its case-law, the procedure to be followed in order to resolve any dispute between the institutions of the Member States concerned as regards the validity or the accuracy of an E 101 certificate, the institutions of those States applying Regulations Nos 1408/71 and 574/72, including the Swiss Confederation pursuant to the EC-Switzerland Agreement, must follow that procedure, even if it were established that the conditions under which the workers concerned carry out their activities clearly do not fall within the material scope of the provision on the basis of which the E 101 certificate was issued.