48. The International Whole Vehicle Type Approval (IWVTA) Chair informed GRSP that following the adoption by AC.1 of an amendment to Schedule 5 of the 1958 Agreement during its March 2025 session, IWG IWVTA had prepared amendments to delete the Unique Identifier (UI) descriptions from UN Regulations Nos. 16 (informal documents GRSP-77-03, GRSP-77-04 and GRSP-77-05), 22 (informal documents GRSP-77-06 and GRSP-77-07), 44 (informal document GRSP-77-08) and 129 (informal documents GRSP-77-09, GRSP-77-10, GRSP-77-11 and GRSP-77-12). He suggested that it would be desirable to implement these amendments in conjunction with other revisions at an appropriate time. The expert from the Kingdom of the Netherlands supported the amendments and reiterated the suggestion to wait until other amendments were needed for each of the affected regulations in order to group them with these amendments and avoid a proliferation of supplements. GRSP adopted all ten informal documents in principle and agreed to wait to convert them into working documents until other amendments to the concerned UN Regulations were needed.