61As regards the question whether the Austrian legislation at issue in the main proceedings constitutes a restriction on the freedom of establishment or on the freedom of movement for workers, it must be borne in mind that Regulation No 883/2004 does not establish a common scheme of social security, but allows different national schemes to exist. Member States retain the power to organise their social security schemes and, in the absence of harmonisation at EU level, it is for each Member State to determine in its legislation, in particular, the conditions for entitlement to social benefits. In exercising those powers, Member States must nonetheless comply with the law of the European Union and, in particular, with the provisions of the FEU Treaty giving every citizen of the European Union the right to move and reside within the territory of the Member States (see, inter alia, judgments of 21 February 2013, Salgado González, C‑282/11, EU:C:2013:86, paragraphs 35 to 37; of 5 November 2014, Somova, C‑103/13, EU:C:2014:2334, paragraphs 33 to 35; and of 21 October 2021, Zakład Ubezpieczeń Społecznych I Oddział w Warszawie, C‑866/19, EU:C:2021:865, paragraph 27 and the case-law cited).
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