Hi parthiban-v!
There is an option in the invoice template that lets you hide or show the invoice number. Let's check it out and make sure it's set to show the number.
- Open your invoice transaction.
- Click Customize at the bottom.
- Choose Edit current to open the template you use.
- Click the Content bar at the top and the heading section of the previewed invoice on the right.
- In the Form section, place a checkmark in the Form numbers checkbox.
- Click Done to save your changes and try printing the invoice again.
Let me know if you have additional questions, you can also check more information about customizing invoice forms.
Have a good one!