Group 1 - The article discusses the process of handling errors in issuing VAT invoices by individuals, specifically focusing on the procedures for red-invoice adjustments and cancellations [2][8]. Group 2 - For red-invoice adjustments, users must log into the electronic tax bureau, navigate to the relevant sections, and submit the necessary information for review [4][5][7]. - The steps include selecting the invoice to be adjusted, confirming the reason for the adjustment, and submitting the request for tax authority approval [6][7]. Group 3 - For invoice cancellations, users also log into the electronic tax bureau and access the cancellation function [9][22]. - The process involves selecting the invoice to be canceled, confirming the details, and submitting the cancellation request [10][11][12]. Group 4 - The mobile app provides similar functionalities for both red-invoice adjustments and cancellations, allowing users to complete these processes on their devices [13][21]. - Users can track the progress of their requests through the app [20].