A purchaser who has recourse to a central purchasing body shall be deemed to have complied with its advertising and competitive tendering obligations, provided that the central purchasing body complies with the provisions of this Book or with the objectives of Directive 2009/81/EC of the European Parliament and of the Council of 13 July 2009 on the coordination of procedures for the award of certain works contracts, by contracting authorities/entities in the fields of defence and security, and amending Directives 2004/17/EC and 2004/18/EC, and that the contracts awarded are subject to effective review.