https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=40863 --- Comment #39 from Katrin Fischer <katrin.fischer@bsz-bw.de> --- Maybe something to check as well: In Administration > Koha to MARC Mappings: What MARC field is linked to biblios.biblionumber? Are you using MARC21 or UNIMARC? David was missing the 999 in your records, but from the output you posted, it looks like your Koha installation was configured differently: BIBLIONUMBER in : 090$9 BIBLIOITEMNUMBER in : 090$a ============================ Do you remember if you changed anything? Is this an old installation or a newer one? (which version did you start with?) -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.