Thanks for sharing the details with us, @Carolexx.
The Profit and Loss reports are the distributions of all income and expense accounts. It'll show the income account associated with the product used in the invoice.
Running the report in a cash basis shows invoices that are paid. You'll want to open the Transaction Journal report of the transaction to review it. Here's how.
- Click the amount link from your Profit and Loss report.
- Select the appropriate invoice.
- Click More and select Transaction Journal.
I also recommend getting in touch with your accountant to further assist you with this. This way, we'll ensure the accuracy of your books after making some changes.
I'm also adding this article that can guide you in customizing your reports and shows the data you need: Customize reports in QuickBooks Online.
Let me know if there's anything else you need help with. I'm always here to assist you. Keep safe!