This document will outline how to define the default classification source that the system should use when filing callnumbers. This system preference will impact on which classification source is automatically defined in an item record. 

To find this system preference go to Koha administration > System preferences and search for DefaultClassificationSource. 

This will bring up a system preference of the same name. 

This field will contain the name of the classification source that has been selected by the system preference. Alternative classification sources can be selected from the dropdown menu in the system preference.