I am trying to send a invoice and it says the number has already been used. It won't let me send it?

Good day, shanehouke-yahoo.

Let me help accomplish your task by making sure you're able to send invoices in QuickBooks. 

If you're getting this prompt, then you might be using the same invoice number twice when sending the transaction. You can use it again, though this will reset your sales number. 

If you're seeing Yes in the popup message, simply click it to confirm your action and send your invoice. Your next transaction will now follow this sequence. 

Moreover, you can set your own numbering preferences inside QuickBooks: Add custom transaction numbers to sales forms in QuickBooks Online.

Reach out to me whenever you have additional questions or concerns about sending invoices. Please know the Community has your back, and I'm here ready to help you. Have a good one.

Hi @shanehouke-yahoo,

Hope you’re doing great. I wanted to see how everything is going about the invoice concern you had the other day. Was it resolved?

Do you need any additional help or clarification? If you do, just let me know. I’d be happy to help you at anytime.

Looking forward to your reply. Have a pleasant day ahead!