Group 1 - The article provides guidelines for issuing tax-related invoices in compliance with regulations, emphasizing the importance of accurate classification according to the tax service categories [3][4]. - It outlines prohibited behaviors related to issuing false invoices, including issuing invoices that do not match actual business operations [4]. - The article stresses the necessity of selecting the correct tax classification code from the official tax classification table to avoid invoice issuance failures [4][11]. Group 2 - The process for issuing invoices includes logging into the electronic tax bureau, navigating to the invoice issuance section, and selecting the appropriate invoice type [5][6][8]. - It details the steps for entering the necessary information, including selecting the client and accurately filling in the service name and tax classification code [10][11]. - The completion of the invoice issuance process is highlighted as a reflection of the professionalism and credibility of the tax service institution [14].