36. The expert from the Netherlands sought GRE guidance on the issue of old, possibly obsolete transitional provisions in former series of amendments to UN Regulations (GRE-80-06). GRE considered different approaches and decided to keep such old provisions in later series for the sake of record. GRE noted that, according to the revised 1958 Agreement, each series of amendments and Supplements to it constitute “a version of a UN Regulation” and that Contracting Parties may opt for application of former versions. Thus, different series of amendments to the same UN Regulation may be considered independent from each other and Supplements to the latest series do not automatically apply to previous series.