Prevent Duplicate Vouchers


You can use the following option in Tally ERP to prevent upload of duplicate Vouchers


1. Gateway of Tally || Accounts Info ||  Voucher Types || Alter

2. Next, select the Voucher type (say Sales or Purchase)

3. Next, set the Voucher Numbering to "Manual"

4. Next, set the option Prevent duplicates as "Yes"


PS:
The "Prevent duplicates" option is enabled only if there are no entries for that voucher-type in your Tally Company.