How do I review and fix HSN codes?

1. In the detailed view, click Review HSN Code (top right). It opens the HSN table for each marketplace's data in the period.

   

2. Problem rows come first: codes that are missing, shorter than 4 digits, or not in the GST master list are flagged red.

3. Don't know the right code? Click Find by name on the row and type the product (e.g. "cotton shirt") - exact code matches rank first, and you can search by code or product name.

4. Rows with an engine suggestion have a one-click Use button - or accept every suggestion at once with Apply all.

5. Click Save - corrections are stored, applied to Table 12, the JSON, and the CSV exports, and re-checked by validation on the next run.

💡 HSN rules depend on your turnover slab: under ₹5 Cr, B2C HSN is optional (B2B still needs 4+ digits); over ₹5 Cr, 6-digit codes are mandatory everywhere. Fixing "not in master" flags.