REX system in the SPG area - full application for some countries from 01/07/2018 In the framework of the Generalized System of Preferences, starting from January 2017, the gradual replacement of FormA certificates began with a self-certification system of origin, by invoice declaration, by registered operators (REX system). The SPG countries and territories have been given the possibility to decide for themselves whether to apply the REX system in 2017, 2018 or 2019. In all three cases a transitional period of one year, which can be extended by six months, was foreseen. the REX system and the FormA certificate can coexist. The first group of countries that have joined the REX system consists of Angola, Burundi, Bhutan, Democratic Republic of Congo, Central African Republic, Comoros, Congo, Cook Islands, Djibouti, Ethiopia, Micronesia, Equatorial Guinea, Guinea-Bissau, India, Kenya, Kiribati, Laos, Liberia, Mali, Nauru, Nepal, Niue, Pakistan, Solomon Islands, Sierra Leone, Somalia, South Sudan, Sao Tome and Principe, Chad, Togo, Tonga, Timor Leste, Tuvalu, Yemen and Zambia. All the countries mentioned, from 01/07/2018, having completed the transitional period, will be able to attest the preferential origin in the SPG area only if registered in the REX system. FormA certificates for the application of preferences can no longer be accepted on import into the EU.