How do I fill the Other Platforms B2B sheet?

1. The workbook has three tabs: How to use, B2B, and Credit Debit Notes. Fill the last two.

2. B2B sheet, one row per invoice line: Date (DD-MM-YYYY), Invoice No., the buyer's 15-character GSTIN, Trade Name, Rate, Taxable Value - plus optional HSN and quantity.

3. An invoice with lines at different GST rates? One row per rate, same invoice number - AprilTax merges them into a single portal-ready invoice.

4. Credit Debit Notes sheet - one row per note: Note Type (C for credit, D for debit), Note No., the Original Invoice No. it adjusts, buyer GSTIN, rate and value (credit-note values negative).

5. Upload under Other Platforms → B2B Sheet - these land in Table 4 (B2B) and Table 9B (CDNR) with full HSN summary support.

💡 Buyer GSTINs are validated - a wrong-format GSTIN is caught by the validation checks before it can bounce at the portal.