Can you help. QB is providing in new invoice created a number that is already exist. every time I am creating a new invoice the automatic number is already existing. help

Hello, 

Creating invoices in QuickBooks Online should be a simple and straightforward process. Each time an invoice is created, the invoice number should proceed in sequential order. If you're noticing that the invoice number is duplicating each time you generate a new sale, there's a few troubleshooting steps you can try in order to resolve this.

I'd recommend turning on Custom Transaction Numbers. This setting allows you to control the sequence order for your invoice numbers. By entering a new starting number, this may help to re-trigger the numeric system being inputted on your invoices. Here's how to set that up:

1. Select the Gear icon on the Toolbar, then Account and Settings (or Company Settings).
2. Select Sales, then select anywhere within the Sales form content section.
3. Check the box next to Custom transaction numbers.
4. Select Save and then Done.
5. Open an invoice or any sales form, 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 noticing the issue persisting, try some browser troubleshooting to rule out any web issues. 

Try clearing the cache and cookies in your browser to remove the stored Internet files that build up over time. These stored files can cause bugs in QBO and other sites. Here's how to clear them: Clear cache and cookies to fix issues when using QuickBooks Online. 

If the issue persists, try using an Incognito window in Google Chrome. This is a private browsing mode that operates separately from the main browser, and it doesn't get impacted by stored cache and cookies. Here's more information about that and how to use it: Browse in Private. You should also try using multiple different browsers to get things back on track.

If you're still in need of assistance, please reach out to our tech support team so an agent can investigate this further. 

Cheers.