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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/td9rel54/tdlreference/release_6_3.htm

TDL Changes in Release 6.3

This page includes information on all the changes made in TDL to support GCC VAT on Tally.ERP 9.

To know the changes in Default Invoices, refer to the updates in Simple Printed Invoice , Comprehensive Invoice , POS Invoice , and Schema to support GCC VAT features in Tally.ERP 9.