Where to find LUT number?

To clarify, you're dealing with a Letter of Undertaking (LUT) for exports under GST, and you've received an Application Reference Number (ARN) and a Reference Number after your LUT was deemed approved. The question is, which number should you use on your invoices? *LUT Reference Number vs. ARN:* -

 *Reference Number*: This is the number you should mention on your invoices for exports made under the LUT. It's usually provided after the LUT application is deemed approved, and its format may vary. -

 *ARN (Application Reference Number)*: This number is generated when you file your LUT application. While it's useful for tracking the status of your application, it's not typically mentioned on invoices.¹

² *What to Do:* - Use the *Reference Number (Order Number)*, which in your case seems to be `ZD2XX924XX03X71`, on your export invoices as proof of having an approved LUT for the relevant financial year. - Keep the ARN (`AD2709XX0XX707W`) for your records, as it helps track your application. By mentioning the Reference Number on your invoices, you can ensure compliance with GST regulations and facilitate smooth exports.