31In this respect, it must be noted that, in the absence of harmonisation of national enforcement procedures, the detailed rules establishing the right of appeal against a decision ruling on the legality of a contractual clause, arising in the course of mortgage enforcement proceedings, are matters falling within the domestic legal order of each Member State, in accordance with the principle of the procedural autonomy of the Member States. Nonetheless, the Court has emphasised that those detailed rules must meet the conditions that they should be no less favourable than those governing similar domestic situations (principle of equivalence) and that they should not in practice render impossible or excessively difficult the exercise of rights conferred by the EU legal order (principle of effectiveness) (see, to that effect, judgments in Mostaza Claro, C‑168/05, EU:C:2006:675, paragraph 24; Asturcom Telecomunicaciones, C‑40/08, EU:C:2009:615, paragraph 38; Aziz, EU:C:2013:164, paragraph 50; and Barclays Bank, EU:C:2014:279, paragraph 37).
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