De første to cifre (på nuværende tidspunkt 00 for regulativet i dets oprindelige version) angiver den ændringsserie, som omfatter de seneste væsentlige tekniske ændringer af regulativet på godkendelsestidspunktet.
Its first two digits (00 for the Regulation in its present form) shall indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval.