In Tally Prime, using the supplier’s invoice/reference number and date is essential for maintaining accurate records and ensuring traceability. Here are some scenarios where you should use these fields:

1. Purchase Vouchers: When recording a purchase transaction, enter the supplier’s invoice number and date to match your records with the supplier’s documents. This helps in tracking payments and managing accounts payable.

2. Sales Vouchers: If you are issuing a sales invoice based on a supplier’s invoice (like in the case of trading businesses), you can reference the supplier’s invoice number and date for better traceability.

3. Debit/Credit Notes: When issuing debit or credit notes related to a specific supplier invoice, include the supplier’s invoice number and date to ensure the adjustments are correctly linked to the original transaction.

4. Stock Items: For excise sales, excise debit notes, excise material out, excise stock journal, or journal vouchers, you can link the supplier’s invoice number and date to each stock item

5. Purchase Register: Viewing the supplier’s invoice number and date in the purchase register helps in verifying the details during audits and reconciliations

Using these fields correctly ensures that your financial records are accurate and that you can easily trace back any transaction to its source document. If you need help enabling these fields in Tally Prime, there are tutorials available online