This release previously had just one label pair: Flying Nun Records - FN147 (L30331)
All I did was edit the labels so that there were two:
Flying Nun Records - FN147
Festival Records - L30331
Now the release sidebar has some odd issues: it says the label is a catalog number and one of the catalog numbers is the barcode...
In the edit history was this: http://ngs.musicbrainz.org/edit/14460071 which says "An error occured while loading this edit."