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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/te9rel51/Release_5_1_2/Product_Improvements.htm

Release 5.1.2 - Product Improvements

VAT

      The issue of Not Applicable being printed after each item in sales invoice with VAT inclusive class, resolved: When a sales invoice with VAT inclusive class was printed, Not Applicable appeared with VAT amount after every item.

*States covered for enhanced VAT experience