Case C-326/15: Judgment of the Court (Fourth Chamber) of 21 September 2017 (request for a preliminary ruling from the Administratīvā apgabaltiesa — Latvia) — ‘DNB BANKA’ AS v Valsts ienemumu dienests (Reference for a preliminary ruling — Taxation — Value added tax — Directive 2006/112/EC — Article 132(1)(f) — Exemptions for certain activities in the public interest — Exemption for the supply of services by independent groups of persons for their members — Applicability to financial services)