45In any event, it is clear from the settled case-law of the Court that, although it is for the legislation of each Member State to lay down the conditions for creating the right to become affiliated to a social security scheme, the Member States are nevertheless required to abide by the provisions of EU law in force when setting those conditions. In particular, the conflict rules laid down by Regulation No 883/2004 are mandatory for the Member States, and the latter do not have the option to determine to what extent their own legislation or that of another Member State is applicable (see, to that effect, judgment of 25 October 2018, Walltopia, C‑451/17, EU:C:2018:861, paragraphs 47 and 48 and the case-law cited).
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