You can easily add your own debit note number series in Moon Invoice by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the main menu on your left, go to Purchases ➜ Debit Notes.
3. Open the existing debit note, and click on the Edit icon.
4. Click on Debit Note # and enter your custom debit note number.
5. Finally, click Save to apply the changes.

Note:

After creating the new debit note series, all subsequent debit notes will be saved under the next number.