Judgment_paragraph 46 · Salzburger Gebietskrankenkasse and Bundesminister für Arbeit, Soziales und Konsumentenschutz v Alpenrind GmbH and Others (C-527/16)

46If it were to be accepted that, apart from cases of fraud or abuse of rights, the 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 A1 certificate declared invalid, there would be a risk that the system based on sincere cooperation between the competent institutions of the Member States would be undermined (see, to that effect, as regards E 101 certificates, judgments of 26 January 2006, Herbosch Kiere, C‑2/05, EU:C:2006:69, paragraph 30; of 27 April 2017, A-Rosa Flusschiff, C‑620/15, EU:C:2017:309, paragraph 47; and of 6 February 2018, Altun and Others, C‑359/16, EU:C:2018:63, paragraphs 54, 55, 60 and 61).