[Koha] MARC field 264

[Bob Ewart]

I'm currently using Koha 18.11.  I started with Koha in November of 2009 
updating as needed.

Recently I noticed that LOC and Amicus are using field 264 instead of 
260 for publication data.  I don't see 264 anywhere in the Koha frameworks.

What do I have to do to get 264 as well as 260 (which are all my older 
records) to show in the frameworks and be displayed as the publication data?

Bob Ewart