Judgment_paragraph 47 · 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)

47If it were accepted that a competent national institution could, by bringing proceedings before a court of the host Member State of the worker concerned to which that institution belongs, have an E 101 certificate declared invalid, there would be a risk that the system based on cooperation in good faith between the competent institutions of the Member States would be undermined (judgment of 26 January 2006, Herbosch Kiere, C‑2/05, EU:C:2006:69, paragraph 30).