Case C-276/06: Order of the Court (Fifth Chamber) of 17 April 2007 (reference for a preliminary ruling from the Tribunal du Travail, Verviers (Belgium)) — Mamate El Youssfi v Office National des Pensions (ONP) (Article 104(3), first subparagraph, of the Rules of Procedure — Euro-Mediterranean Agreement EC-Morocco — Article 65 — Principle of non-discrimination in matters of social security — Statutory Guaranteed Income for Elderly Persons)