reporting on Reservation usage.

Hi,

     I'm trying to get at the 'in use' capacity for a reservation via vRO or The API , and can't seem to find this anywhere, can anyone Help?

Within vRO , I can get the reservation capacity.... but not the amount 'in use' via the 'vCACReservation'

I can 'get the BusinessGroup Capacity/Usage via vCACCAFEBusinessGroup

But my issue is the BusinessGroups comprise of multiple reservations on different Farms, So I need to break down the usage by reservation so I can see if any individual Reservation is approaching capacity.

Basically, I want to be able to pull the data that's displayed in the GUI in 'Infrastructure/Reservations/Reservations'

          Thanks,

                    John,