Case C-156/17: Judgment of the Court (Seventh Chamber) of 30 January 2020 (request for a preliminary ruling from the Hoge Raad der Nederlanden — Netherlands) — Köln-Aktienfonds Deka v Staatssecretaris van Financiën (Reference for a preliminary ruling — Free movement of capital and liberalisation of payments — Restrictions — Taxation of dividends received by undertakings for collective investment in transferable securities (UCITS) — Refund of tax withheld on dividends — Conditions — Objective differentiation criteria — Criteria which are by nature or in fact favourable to resident taxpayers)