Trying to enter a loss from a K-1 (<$1000) and Turbo Tax enters it as $0. The K-1 has box 2 filled in with the loss, and box 20 with codes Z and AB; that's it. Any ideas?

My partners have their taxes done by professionals and claim a Schedule E gets created as well as the K-1, and the loss gets deducted from their income. Does anyone know if there are limitations on losses from a K-1?