Hiya Let's move this one to koha-devel too please Chris On 17 Mar 2011 07:38, "Peter Huerter" <pete.huerter@gmail.com> wrote: Hi Chris, I am invoking it as a callback. In order to get it to work I had to respond to the error in the koha-error_log, however I re-factored the code for our purposes. Perhaps there is another issue then, but I am pretty sure I am using the value_builder structure in the way it is intended. Thanks, Pete. -- View this message in context: http://koha.1045719.n5.nabble.com/callnumber-pl-errors-in-koha-error-log-tp3... Sent from the Koha - Discuss mailing list archive at Nabble.com. ___________________________________... Koha mailing list http://koha-community.org Koha@lists.katipo.co.nz http://lists.katipo.co.nz/mailm...