40In the absence of EU legislation in this area, the rules implementing the principle of res judicata are a matter for the national legal order, in accordance with the principle of the procedural autonomy of the Member States. However, such procedural rules must not be less favourable than those governing similar domestic situations (principle of equivalence) and must not be framed in such a way as to make it in practice impossible or excessively difficult to exercise the rights conferred by EU law (principle of effectiveness) (see judgments in Fallimento Olimpiclub, C‑2/08, EU:C:2009:506, paragraph 24, and Impresa Pizzarotti, C‑213/13, EU:C:2014:2067, paragraph 54 and the case-law cited).
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