https://help.tallysolutions.com/docs/te9rel60/Data_Management/DM_Tally_Audit.htm

Tally Audit

Audit is an important function of any business organization, it denotes that the business has True and Fair transactions during the year. Tally.ERP 9 has an inbuilt feature- Tally Audit which enables the auditor to perform an audit or track changes that affect the integrity of a transaction,  such as changes made to Date, Ledger Masters and Amounts in the Voucher are reflected in the Tally Audit Listings.  

To know more, click the links below:

     Enabling Tally Audit

     Viewing Tally Audit Listings for Voucher Types

     Viewing Tally Audit Listings for Masters

     Viewing Tally Audit Listings for Users