Invoice number related issue

I'm here to help you manage your invoice numbers, sumand.

What specific issue have you experienced with invoice numbers? If you want to set your own numbering preference, you can use the Custom transaction numbers feature to set your own numbering preference. This adds an Invoice no. field where you can enter any number or letter format you want.

1. Click the Gear icon on the Toolbar, then Account and Settings.
2. Select Sales, then click the Sales form content section.
3. Check the box next to Custom transaction numbers.
4. Select Save and then Done.

Then, you can try opening an invoice, and in the Invoice no. field, enter the custom number or letter sequence you want to use for your forms. The sequence you set here applies to all sales forms.

If you're referring to something else, any additional information is much appreciated. Take care and have a great day!