Didn't go through the tests yet.
Perhaps not the wording we'll want to be using under each of the circumstances that create a positive or negative charge.
We should elaborate during the next standup perhaps.
It was implemented as a potential future feature, where despite the sku costs and free units, the package cost could still be set separately.
At the very least there's a spelling error in the word "commission", but since its also a FIXME, that's not even what I seek to point out.