2011/11/14 Amber Amland <library@mountainviewics.org>

We just upgraded Koha, and in MARC the fields such as 650 a are locked, and it looks like you’re supposed to use authority search to fill them in. However, authority search doesn’t work, and I often have new names or subjects that wouldn’t be in there (I think). Does anyone know how to unlock those fields?

We’re now using Koha version 3.06.00.000 on Linux library 2.6.31.5-0.1-desktop #1 SMP PREEMPT 2009-10-26 15:49:03 +0100 i686 i686 i386 GNU/Linux

Go to Koha Administration -> Catalog -> MARC Bibliographic framework
click on "MARC structure" link related to framework you want to change
search for tag 650, click on "Subfields", than on subfield "a", and than "display more constraints"
remove TOPIC_TERM under Thesaurus

But, maybe better idea would be to solve your problem with searching and content of authority file. How exactly did you try your search and what went wrong? What do you think it should be in your authority files?
Did you use Koha authority files before?

Marijana