Technical acceptance procedures (Art. 41) Concerning technical acceptance, it is necessary to distinguish between: 1° Preliminary technical acceptance within the meaning of Article 42; and 2° Ex post technical acceptance within the meaning of Article 43. The contracting authority may waive all or part of the technical acceptance procedures where the contractor can prove that the products have been controlled by an independent body during their production, in accordance with the specifications of the procurement documents. In this respect, any other certification procedure in force in a Member State of the European Union is regarded as comparable to the Belgian conformity certification procedure and deemed equivalent .