If changes to the HSN code in the item master are not showing in the billing, follow these steps:
Step 1:Resave Voucher: Resave the voucher where you made the changes. Alternatively, remove the product using the F9 key and enter it again.
Step 2:Check Effective Date: In the item master, check the effective date. If it's greater than the invoice date, the changes will apply from that date.
Step 3:Multi-Financial Year: If using multi-financial years, ensure all necessary data (like Tax category, HSN code) from the last year is carried forward correctly to the current year.