Core Viewpoint - The article provides a detailed guide on how to issue red-letter invoices using the electronic tax bureau app, emphasizing the importance of following the correct procedures for various scenarios such as sales returns or invoice errors [2]. Part 1: Red-letter Information Confirmation Form Entry - Step 1 involves logging into the electronic tax bureau app and navigating to the red-letter invoice issuance section [5]. - Step 2 requires users to enter the necessary details to query the blue-letter invoice information, allowing them to select the invoice they wish to redress [8]. - Users can view detailed information about the selected blue-letter invoice, including basic information and invoice status [9]. - The system allows users to select a specific reason for issuing the red-letter invoice, controlling the editable fields based on the selected reason [10]. - After confirming the details, users can submit the red-letter invoice request, which will generate the invoice if the conditions are met [11][15]. Part 2: Processing Red-letter Information Confirmation Form - Taxpayers can either confirm or reject the red-letter information confirmation form they receive, with options to withdraw their request if necessary [16]. - The processing interface allows users to search for and manage their red-letter information confirmation forms based on their role as either the seller or buyer [18]. - If the confirmation requires both parties' agreement, the initiating party can withdraw the request if the other party has not yet confirmed [28].