In public contracts for works, services and supplies, an arbitration clause inserted without the prior reasoned authorisation of the governing body of the contracting authority is void pursuant to Article 209(3) of Legislative Decree No 50 of 18 April 2016, and the awards rendered on the basis of such a clause are consequently void, this being a mandatory provision compliance with which conditions the validity of recourse to arbitration, including for clauses inserted in contracts concluded before the entry into force of the new legislation, where the arbitral proceedings were commenced thereafter.