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Thanks for reaching out to the Community, @paul108.
Before going into detail, I want to ask if you could provide me a screenshot of the invoice ledger?
In the meantime, you can locate your invoices in several places. You can identify them by going to that specific customer, going to the Invoices page, and also through an invoice report.
Here's how to find your customer's invoice list, follow the instructions below:
For more information about invoice reports, you can refer back to this article: Invoice Reports in QuickBooks Online.
Let me know if the steps above do the trick. If you have any more questions, please don't hesitate to comment below. Happy Friday!