GRSP sought WP.29 guidance on an apparent contradiction between transitional provisions 15.1.2. and 15.1.3. in the 06 series of amendments to UN R22 (helmets) and article 12.4 of Revision 3 of the 1958 Agreement. WP.29 agreed that the provisions of the 1958 Agreement should prevail over those of specific UN Regulations and that these transitional provisions are invalid, even though the 06 series entered into force on 3 January 2021 after Revision 3 of the 1958 Agreement entered into force on 14 September 2017. Article 12.4 applies to all UN Regulations regardless of date of issuance and preserves each Contracting Party’s freedom to choose whether to accept type approvals issued pursuant to earlier versions.