Partially paid invoices not appearing for manual payment

Hi Colleagues,

On the AP Trial Balance I have two invoices for a supplier.

One shows a payment status of Partially Paid and has a Remaining Amount.

A second one shows a payment status of Fully Paid and also has a Remaining Amount.

So my AP TB shows this supplier has an amount outstanding, in effect unpaid.

When I run my Invoice Aging report for this supplier, no data is found.

When I query both invoices in AP module, indeed both are partially paid. Both invoices have a balance between the invoice amount and the amount already paid.

I've tried to manually pay them, but cannot match them to any invoices.