In the documentation of system preference UpdateNotForLoanStatusOnCheckout it says that you can use ONLYMESSAGE to show the description of the not for loan status. "This system preference can also be used to only display the not for loan status. To do so, enter ONLYMESSAGE on the right of the colon. For example -1: ONLYMESSAGE This will simply show the label for -1 without changing the status." This is not true because ONLYMESSAGE works only with system preference UpdateNotForLoanStatusOnCheckin. The incorrect info is at least in 23.11 and 24.05 manuals. https://koha-community.org/manual/24.05/en/html/circulationpreferences.html#updatenotforloanstatusoncheckout (If you add ONLYMESSAGE to the UpdateNotForLoanStatusOnCheckout syspref, the notforloan status is removed from the item and the change is not recorded to action_logs when you checkout the item. No need to fix this but I added this info for the record.)