1. Take a backup of the Tally data. Do a manual backup of the Company giving the error. 2. Disable autoloading of Companies Set Gateway > Configure > Data Configuration > Load Companies on start-up = No This can also be changed by editing the ini configuration file. 3. Open Tally in debug mode from the Command Prompt Start > Run. For example - (C:\Tally.ERP9\tally.exe C:\Tally.ERP9\Data\ 2517) In the above example 2517 is the duplicate id no 4. Rewrite the problematic Tally.ERP9 company Rewrite by Ctrl+Alt+R from the Company Info screen and selecting the problematic Company. Select “Yes†to rewrite the data. 5. Remove other duplicates Repeat 3 to 4 above if necessary until all Duplicates have been removed. Inserting the new error ids. Conclusion The Tally.ERP9 should function normally when all duplicates have been removed. Query: What is the procedure to rewrite the data forcefully? Solution Zero Rewrite Procedure The procedure to rewrite data forcefully is as follows: Go to Start Select Run Type Tally exe followed by the <file path> <Data path> 0 (E.g.: C:\Tally.ERP 9\Tally.exe Data 0) Press Enter The Company Info Menu appears Press Ctrl + Alt + R. The List of Companies appear under the title Rewrite Company 5. Select the required company whose data needs to be rewritten. 6. Tally.ERP 9 prompt you with the following message Re-write? Yes or No 7. Press Y to rewrite the data 8. On completion check the data. credits: http://blog.avionindia.com/2013/05/tally-data-recovery-zero-rewrite.html
