A colleague (we'll call him an idiot), put a generic entry into U 37-38 of a rack (ie, text, not tied to an asset). Being especially clever, he then tried to add another device that ran from 39 to 30, and ITFlow accepted it, but nothing was entered. He (and then I) tried to add a single entry to U 39, and ITFlow errored, saying it was already in use (but nothing was showing).
We're only keeping around because he's able to find these bugs for you… and probably because he outranks me… 🙂