De første to cifre (for tiden 00 for regulativet i dets oprindelige form) angiver den ændringsserie, som inkorporerer de seneste større tekniske ændringer til regulativet på tidspunktet for godkendelsen.
Its first two digits (at present 00 for the Regulation in its original 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.