Judgment of the Court (Sixth Chamber) of 9 September 2021.#RK v CR.#Request for a preliminary ruling from the Oberlandesgericht Köln.#Reference for a preliminary ruling – Judicial cooperation in civil matters – Succession – Regulation (EU) No 650/2012 – Article 6(a) – Declining of jurisdiction – Article 7(a) – Jurisdiction – Examination by the court second seised – Article 22 – Choice of law applicable – Article 39 – Mutual recognition – Article 83(4) – Transitional provisions.#Case C-422/20.