I appreciate you for reporting this to us, Ze.

The issue you're experiencing in converting your sales order to an invoice can be related to the browser you're using.

To address this, we can take a troubleshooting step to determine if the browser is the cause of the issue.

Begin by clearing your browser's cache and cookies. This will remove outdated files and refresh the system, helping to remove any browser-related problems.

Also, please ensure you're using a supported browser to ensure optimal compatibility with QuickBooks.

If the issue persists, another option is to delete the sales order and recreate it.

Feel free to let us know if you have additional questions. The Community space is available 24/7.