Description of problem: You get an error message when trying to attach a core/ram based subscription that says "Consumer does not support core calculaton required by pool" The word calculaton is a misspelling of calculation. See https://bugzilla.redhat.com/show_bug.cgi?id=981531 for more details.
Fixed by cb30e157. You should see this in 0.8.18 or later.
Closing out old bugs. If you are still having issues, please feel free to re-open.