Judgment of the Court (First Chamber) of 9 September 2021.#Proceedings brought by UM.#Request for a preliminary ruling from the Oberster Gerichtshof.#Reference for a preliminary ruling – Judicial cooperation in civil matters – Succession – Regulation (EU) No 650/2012 – Article 3(1)(b) – Concept of ‘agreement as to succession’ – Scope – Contract transferring ownership mortis causa – Article 83(2) – Choice of applicable law – Transitional provisions.#Case C-277/20.