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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel63/Tax_India/VAT/Tamil_Nadu/Return_Transaction_Book.htm

Return Transaction Book (Tamil Nadu)

The Return Transaction Book displays the details of various VAT forms which were saved by clicking F6: Save button. Each time the VAT and CST forms are modified, the details will be captured as a separate section in this book.