Case C-203/24, Hakamp: Judgment of the Court (Sixth Chamber) of 4 September 2025 (request for a preliminary ruling from the Hoge Raad der Nederlanden – Netherlands) – KN v Raad van bestuur van de Sociale verzekeringsbank (Reference for a preliminary ruling – Social security – Migrant workers – Legislation applicable – Regulation (EC) No 883/2004 – Article 13(1) – Regulation (EC) No 987/2009 – Article 14(8) and (10) – Worker normally employed in several Member States – Pursuit of less than 25 % of the activity in the Member State of residence – Concept of substantial part of the activity – Connecting factors relating to working time and/or remuneration – Consideration of other circumstances – Length of the assessment period – Discretion of the competent institutions)