19. GRSP note that WP.29 at its November 2023 session had returned ECE/TRANS/WP.29/2023/115 to GRSP for further revision (see ECE/TRANS/WP.29/1175, paragraph 106). The expert from OICA, explained that the proposal of Supplement 1 to the 10 series of amendments had already been incorporated in the 11 series of amendments to UN Regulation No. 17 that had been adopted at the November 2023 session of WP.29. He further explained that this supplement would imply a new provision that would enter into force immediately creating problems to manufacturers. Therefore, he suggested that the proposal be withdrawn. The expert from Germany, author of ECE/TRANS/WP.29/2023/115, insisted that the proposal was still needed. He offered to revise the proposal for further discussion at the May 2024 session of GRSP.