https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21517 --- Comment #2 from Jonathan Druart <jonathan.druart@bugs.koha-community.org> --- I think I got it, the from/until parameters are used to retrieve the biblionumber of the records we will display. But the "datestamp" value is filled with the following query (from Koha/OAI/Server/ListBase.pm): $sql = " SELECT MAX(timestamp) FROM ( SELECT timestamp FROM biblio_metadata WHERE biblionumber = ? UNION SELECT timestamp FROM deleteditems WHERE biblionumber = ? UNION SELECT timestamp FROM items WHERE biblionumber = ? ) bi "; So my guess is that the bibliographic records have not been modified inside the date range, but items have been added/modified outside of it (in 2014). -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.