Judgment of the Court (Second Chamber) of 16 December 1992 in Case C-206/91 (reference for a preliminary ruling from the Tribunal des affaires de sécurité sociale, Bobigny): Ettien Koua Poirrez v. Caisse d'allocations familiales de la Seine-Saint-Denis, in loco Caisse d'allocations familiales de la région Parisienne (Social security — Disablement allowances — Freedom of movement for workers — Social benefit — Purely domestic situation within a Member State)