Judgment_paragraph 41 · 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)

41Consequently, in so far as an E 101 certificate establishes a presumption that the worker concerned is properly affiliated to the social security system of the Member State in which the undertaking employing him is established, it is binding on the competent institution of the Member State in which that person actually works (see, to that effect, judgment of 30 March 2000, Banks and Others, C‑178/97, EU:C:2000:169, paragraph 40 and the case-law cited).