50In that regard, in the absence of harmonisation of the national mechanisms for enforcement, the rules implementing the grounds of objection allowed in mortgage enforcement proceedings and the powers conferred on the court hearing the declaratory proceedings, which enjoys jurisdiction to analyse the lawfulness of the contractual clauses on the basis of which the right to seek enforcement was established, are a matter for the national legal order of each Member State, in accordance with the principle of the procedural autonomy of the Member States, on condition, however, that they are no less favourable than those governing similar domestic actions (principle of equivalence) and do not make it in practice impossible or excessively difficult to exercise the rights conferred on consumers by European Union law (principle of effectiveness) (see, to that effect, Case C-168/05 Mostaza Claro [2006] ECR I-10421, paragraph 24, and Case C-40/08 Asturcom Telecomunicaciones [2009] ECR I-9579, paragraph 38).
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