As from September 1, 2021, Contracting Parties applying this Regulation shall not be obliged to accept type approvals to the preceding series of amendments, first issued after September 1, 2021.Until September 1, 2022, Contracting Parties applying this Regulation shall accept type approvals to the preceding series of amendments, first issued before September 1, 2021.As from September 1, 2022, Contracting Parties applying this Regulation shall not be obliged to accept type approvals issued to the preceding series of amendments to thi s Regulation.