[Koha] Can't delete line from "circulation and fine rules"

[klas.blomberg at skovde.se]

Greetings!
This is my first posting to this list, so let my introduce myself:
I work at Bibliotek Mellansjö (Libraries between the lakes - sounds very weird in English, doesn't it?), a consortium of eight public libraries in Sweden, and we migrated to Koha in the middle of january this year. Before that I have been working as systems librarian in both public and academic libraries for eleven years, most of the time with SirsiDynix Symphony - and I have a wishlist with at least a dozen of features from that system I would like to see introduced in Koha......

But, my problem today is more adjacent:
Somehow we made some error when we set up our circulation and fine rules in Koha - so we have some lines in our circulation and fine rules that doesn't contain an item type. Yes, I know, that should not be possible, and I don't know how we made it!
There seems to be no way to modify nor remove those unwanted lines from inside the staff "client", so how can I get rid of them?

Klas Blomberg
IT-bibliotekarie 

Stadsbiblioteket
Skövde Kulturhus
Skövde kommun 
541 83 Skövde   
Direkttelefon 0500-49 85 18
Kontaktcenter telefon 0500-49 80 00 

www.skovde.se