The answers were a graveyard of bad news.
By 4:45 AM, all masters and vouchers were in. He opened the Trial Balance in Tally v10. Then he opened the PDF from v11.
Arjun opened TallyPrime (v11) and began a systematic extraction.
It was 1:17 AM. His client, Shanti Enterprises, had audited their books in TallyPrime (Release 11). The problem? Their new investor, a grumpy traditionalist named Mr. Mehta, refused to upgrade his ancient Tally.ERP 9 (Release 10). “If it isn’t broken, don’t fix it,” Mehta had barked over the phone. “Convert the data to Version 10 by morning, or the deal is off.” how to convert tally data version 11 to 10
Green success messages flashed. “Ledger ‘Sales-A’ imported.” “Stock Item ‘Bolt M8’ imported.” “Voucher No. 1 imported.”
His fingers flew across the keyboard, typing the desperate query into every forum, WhatsApp group, and ChatGPT window he could find:
Of course. v11 had enhanced date handling for e-invoicing. v10 used a simpler calendar. The answers were a graveyard of bad news
Arjun groaned. He was losing the war.
He remembered one more trick: Use a third-party tool as a bridge. Not the shady DLL, but a legitimate free tool: Tally Data Converter Lite by a small firm in Pune. He downloaded it (praying the free trial worked). The tool read his v11 export files, stripped away version-specific tags, and spat out a Tally v10 compatible .TXT file for each master and transaction.
He leaned back, his chair creaking in protest. Then, a memory surfaced. His first job, at a chaotic CA firm. A senior had once whispered a secret: “Tally doesn’t downgrade. But Tally doesn’t know everything. Export the data, transform it, and import into an empty shell.” Then he opened the PDF from v11
On a separate folder, he installed Tally.ERP 9 (Release 10) – the target version. He created a new, empty company named “Shanti_Converted_v10.” Then he opened the Excel files. The v11 export had extra columns: Is GST Registered? , Bill-wise expiry dates , and a weird UDIMasterType that v10 would vomit on.
They matched. Down to the last rupee.
He tried importing the cleaned CSV into Tally v10 using Import of Masters (Gateway → Import → Masters). The screen flickered. Then, the red error box appeared: “Invalid Format. Date field mismatch in Voucher Type ‘Sales’.”
At 5:58 AM, he exported the final Company Data Backup from Tally v10 as a .900 file (the old format). He emailed it to Mr. Mehta with a single line:
But there was a ghost: The opening balance for “Prepaid Insurance” was off by ₹12. He traced it to a journal entry in v11 that used an “Adjustment Period” field—a feature v10 ignored. He manually entered that ₹12 correction via a journal voucher in v10.