Proposal to correct an error in Supplement 24 to the 01 series of amendments (document WP.29/2013/14 adopted by the Forum during its March 2013 session). During the compilation of the collective amendment (GRE-68-02-Rev.2), necessary changes to Regulation No. 6 were overlooked. This amendment proposes to align the treatment of categories 1, 1a and 1b with other categories and devices.