Duplicate transaction line results on saved search

I'm building a report for users to pull Net sales order revenue. I want to capture total order value as well as credits and refunds. The criteria needs to suppress any orders that have not yet been billed.

Orders that are entered with a billing schedule remain in Status = Pending Billing at the point of sale. To capture these orders as well as those in Status = Billed I am filtering for "Billing Transaction is not none". The problem is that I'm getting duplicate line items where there have been multiple billing transactions. For example, Filtering for Period is Last Period, orders on monthly billing schedules will appear twice due to the Cash Sale or Invoice that processed in the current period.