A business entity which deducts input tax from output tax shall maintain the following documentary evidence with its name, address, and business administration number on such documents. 1. Uniform invoices specifying business tax paid on purchases of goods and services. 2. Uniform invoices specifying the amount of business tax issued by the business entity itself under the circumstances deemed as sales of goods or services as prescribed in paragraph 3 or paragraph 4 of Article 3. 3. Other documentary evidence specifying the amount of business tax and approved by the Ministry of Finance.