Item Display Name with Payments

I've created a saved Transaction search that lists the date, amount, customer, sales rep, invoice number...but I can't get the item name/description. It shows up as blank. I've tried using applied to and applying transaction fields to list the item, but to no avail.

We're trying to gather info on the actual amount paid on an invoice for a specific month to calculate actual paid sales amount for each sales rep. Invoices are not always paid in full but over a time period. We need the actual item descriptions for tracking purposes.

How can I get the item description to show up on the search, it doesn't seem to be connected to a payment type - a payment is connected to an invoice which is connected to several items...but I can't seem to get the item list to show up for payments made on invoices.