Group 1 - The article provides a step-by-step guide for taxpayers on how to log in to the electronic tax bureau and apply for the reissuance of export tax refund certificates [1][2][3] - It outlines the process of selecting the type of lost certificate and retrieving relevant information such as original certificate number, issuing authority, and date [4][6] - Taxpayers can save their data, upload necessary documents, and edit details before final submission [7][8][9][11] Group 2 - The article includes instructions on how to correct or void tax declarations through the electronic tax bureau, emphasizing the importance of submitting accurate information [16][17] - It specifies that voiding a declaration is only possible within the corresponding declaration period and under certain conditions, such as not having issued payment certificates [17] - The article also mentions that corrections to corporate income tax quarterly declarations are limited to the most recent submitted quarter, with specific rules for annual reports [17]