When checkin in an item that hasn't been checked out SCO gives the error message: "Item not checked in: please see circulation staff for assistance" which is misleading. One might think the item has been checked out and remains so. Also, there is usually no need to contact staff when returning an item that hasn't been actually checked out. This error messages seems to be a default check-in error message. It says the same when trying to return a non-existent barcode. Which is also misleading and should really say that the item doesn't exist. Would it be possible to differentiate the possible check-in errors and give better feedback to user?