In matters of arbitration, pursuant to Article 818, paragraph 2, of the Code of Civil Procedure, referred to by Article 838-ter, paragraph 4, of the Code of Civil Procedure, before the acceptance of the sole arbitrator or the constitution of the arbitral tribunal, an application for interim measures shall be brought before the competent ordinary court, which exercises a substitute and supplementary function until such time as the arbitral body has been materially constituted and is able to proceed promptly with the examination of the application for interim measures, thereby ensuring the completeness and effectiveness of judicial protection pursuant to Article 24 of the Constitution.