(87)The Commission provides and manages an electronic system, e-Certis, which is currently updated and verified on a voluntary basis by national authorities. The aim of e-Certis is to facilitate the exchange of certificates and other documentary evidence frequently required by contracting authorities. Experience acquired so far indicates that voluntary updating and verification is insufficient to ensure that e-Certis can deliver its full potential for simplifying and facilitating documentary exchanges for the benefit of SMEs in particular. Maintenance should therefore be rendered obligatory in a first step. Recourse to e-Certis will be made mandatory at a later stage.