The invoice should be prepared in triplicate. The original is for the recipient, the duplicate for the transporter and the triplicate for the supplier. The copies should be marked as ‘ORIGINAL FOR RECIPIENT’, ‘DUPLICATE FOR TRANSPORTER’ and ‘TRIPLICATE FOR SUPPLIER’, as the case may be.
(ICAI FAQ PUBLICATIONS 06-09-2017 TAX INVOICE, CREDIT AND DEBIT NOTES: FAQ NO. 37)