[Koha] Changing 00X plugin

Does anybody know how is it possible to change a plugin for 00X fields? I changed the script of the plugin for our purposes and I changed its name (which do I need), but now I cannot change a name of plugin in defining framework structure: Administration>Koha Framework Structure. In Koha Framework Structure, normally it is possible to choose the plugin. However, for the 00X fields there I can't find such a possibility. Thank you Ondrej Mlecka