invoice numbering sequence change. after utilizing the Amazon Connector app in QuickBooks. Since using this app, the invoice number sequence has changed unexpectedly. I

Thank you for joining the QuickBooks Community forum and sharing the details of your situation about your invoice sequence number. I have here information that could help you fix this, stamatakos.

In QuickBooks, the invoice numbering sequence can change unexpectedly due to various reasons, such as updates, third-party integration, data corruption, or user actions. To change the invoice numbering sequence, you can follow these steps: 

To begin, adjust the number and turn off the Custom Transaction Numbers feature. It will provide you with control over the sequence. 

Here's how:

1. Click the Gear icon.
2. Select Account and Settings.
3. Go to the Sales tab.
4. Click the Pencil icon in the Sales form content row.
5. Tick the Custom transaction numbers box.
6. Click Save, then Done. 

By following these steps, you can customize the invoice numbering sequence in QuickBooks to match your desired format.

Furthermore, if you've linked the third-party application or sales channel, you can check their Settings to enable the  Use Next QuickBooks number.

 For additional reference, you can go through these articles: 

• Customize your transaction numbers
• How to change the invoice number on sales forms

With that information, you should be able to change the transaction number of your sales form. If you have more inquiries about handling your daily tasks in QuickBooks Online, post them here in the forum. I'll be sure to answer them in any way possible. Have a great day!