[Koha] Getting OPACFRBRizeEditions to work

Hi all, At Oslo public library we are running a Koha installation and we've tried to turn on all the nice functionalities in Koha such as the frbrising tool, but do not get the same result as Nelsonville public library. At first we thought it might have something to do with the xisbn service (little representation of Norwegian isbns), but this is not the case, there are enough Norwegian isbns for it to work at least on one title. Then we removed the hyphens in isbns, but this didn't change anything. So I was wondering if any of you have had any problems getting this to work? And what did you do to solve it. regards, Anne Karine Sandberg Oslo public library, Norway