74As regards the objective relating to the financial sustainability of the special scheme concerned, although it is true that the risk of seriously undermining the financial balance of a social security system may constitute an overriding reason in the general interest (see, inter alia, judgments of 28 April 1998, Kohll, C‑158/96, EU:C:1998:171, paragraph 41, and of 11 January 2007, ITC, C‑208/05, EU:C:2007:16, paragraph 43), it is not, however, clear from the explanations provided by the Austrian Government how the financing system of that special scheme, which is dependent on the contributions paid by the beneficiaries of that special scheme, would be subject to a risk of being seriously undermined by the fact that recipients of early retirement pensions under the special scheme concerned continue to work in other Member States.
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