Cause of error:
The Sales / Purchase Ledger has "Inventory values are affected" option set as No".
Solution:
Set the "Inventory values are affected" to Yes for the Sales/Purchase ledgers.
Steps
1. Go to Gateway of Tally
2. Select option "Accounts Info >> Ledger >> Alter"
3. Select the Sales/Purchase ledger
4. Set the value for option "Inventory values are affected" to Yes
5. Press Ctrl+A to save it.