Core Viewpoint - The article emphasizes the necessity of issuing red invoices in cases of sales returns, errors in invoicing, suspension of taxable services, and sales discounts, detailing the operational steps for issuing these invoices through the electronic tax bureau [1][4]. Applicable Situations - Red invoices must be issued in the following scenarios: 1. Sales returns (both full and partial) 2. Errors in invoicing 3. Suspension of taxable services (both full and partial) 4. Sales discounts [1]. Operational Process - The steps to issue a red invoice include: 1. Log into the electronic tax bureau and navigate to "Invoice Business" under "Popular Services" 2. Select "Red Invoice Issuance" 3. Enter the required information to find the relevant invoice 4. Choose the reason for issuing the red invoice 5. Confirm the details and submit the red invoice information [2][3]. Important Notes - If the blue invoice has not undergone purpose confirmation or accounting confirmation, the issuer can directly initiate the red invoice process [4]. - If the blue invoice has been confirmed, either the issuer or the recipient can initiate the red invoice process, requiring confirmation from the other party [4]. - For invoices used in export tax rebate applications, specific procedures must be followed to revert the information before issuing a red invoice [4].

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].