Is that a valid use case? Likely. - For free stuff where it's useful to track the "sales" like for stock management or just to know the sold quantity as a stat. - Some real use: http://irc.koha-community.org/koha/2021-05-19#i_2353796 ==Test plan== 1. Try to sell with debit type item with price 0.00 2. Submit 3. page refreshes but no sign of a transaction 4. Register details show nothing either