Hi, If there are any Koha users who have their checkdigit system preference set to 'katipo', please let me know. It's my understanding the this setting was originally created for specifically for the Horowhenua Library Trust, but that they're no longer using it because of their switch to RFID tags. Another Koha developer is doing some work on the patron barcode generation code, and as it happens, if no library is using the "katipo" checkdigit option, for technical reasons it would be nice to remove the code that supports it. Regards, Galen -- Galen Charlton Manager of Implementation Equinox Software, Inc. / The Open Source Experts email: gmc@esilibrary.com direct: +1 770-709-5581 cell: +1 404-984-4366 skype: gmcharlt web: http://www.esilibrary.com/ Supporting Koha and Evergreen: http://koha-community.org & http://evergreen-ils.org