national vehicle registers [2] (nvr) and ecvvr the format of data on the type of vehicle in ecvvr shall have a one to one correspondence with the designation of types and where applicable versions of type in eratvregister of infrastructure (rinf) [3] the lists of parameters and the data format of rinf and eratv shall correspond to each other including any updates or amendments of the rinf and eratv specificationsreference document of national rules (article 27 of directive 2008/57/ec) once the reference document is available the list of parameters for which the conformity assessment is done against national rules indicated in eratv shall have one to one correspondence with the list of parameters indicated in the reference document