The items from journal entries for A/R accounts without entity description. As a default behavior, they show up as -No Customer/Project- on the Customer name column.
1. Navigate to Reports > Customers/Receivables > AR Aging > Customize Summary.
2. Under the Filters tab > expand the Customer/Job folder > select the ID or Internal ID field > set to not empty > hit Done.
3. Rename the Customer A/R Aging Report.
4. At your option, you may mark the Show in Filter Region checkbox before hitting Save.
To access this report again, navigate to Reports > Saved Reports > select your renamed custom A/R Aging Report.