Judgment of the Court (Ninth Chamber) of 4 April 2019.#Proceedings brought by Allianz Vorsorgekasse AG.#Request for a preliminary ruling from the Verwaltungsgerichtshof.#Reference for a preliminary ruling — Public procurement — Conclusion of accession agreements with an occupational provident fund responsible for managing contributions of occupational solidarity — Conclusion requiring the agreement of employees or their representatives — Directive 2014/24/EU — Articles 49 and 56 TFEU — Principles of equal treatment and of non-discrimination — Obligation of transparency.#Case C-699/17.