59In that context, if the referring court considers that the force of res judicata in respect of the judgment of the Consiglio di Stato (Council of State) No 7506 of 1 December 2009 is not relevant to the assessment of the main proceedings, that court will be called upon to interpret the national law applicable as far as possible in the light of the wording and the purpose of Directive 97/13 in order to comply with the obligations arising therefrom. As is apparent from the Court’s settled case-law, this obligation to interpret national law in conformity with EU law is inherent in the system of the Treaty on the Functioning of the European Union, since it permits national courts, for matters within their jurisdiction, to ensure the full effectiveness of EU law when they rule on the disputes before them. It requires that the national court consider, where necessary, the whole body of national law in order to assess to what extent it may be applied so as not to produce a result contrary to EU law, in particular Directive 97/13 (see, to that effect, judgment of 8 November 2016, Ognyanov, C‑554/14, EU:C:2016:835 paragraphs 59 and 66).
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