AP Retainage Billed Report

We are having issues with getting subcontractors who have billed retainage to show up on a report since Sage 300 refuses to create a "bill retainage" button in AP.  When I submit reports to management they have no idea a retainage bill from a subcontractor is out there for payment (they billed their retainage early, which happens all the time).

Does anyone have any ideas or are willing to share how you get this on a report for management?

Thanks,

Susan