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When trying to determine the amount of free space in a space container (Jetcan), the .Capacity and .UsedCapacity members are always returning -1.00000.

To test:
1) Jettison something into space.
2) Open the container.
3) echo ${EVEWindow[byCaption,"Cargo Container"].Capacity} -- ${EVEWindow[byCaption,"Cargo Container"].UsedCapacity}