Hi! As MARC manual say about control number <http://www.loc.gov/marc/bibliographic/bd001.html> *"Field 001 may be system generated"* we wish Koha generate this number (lastUsed++), to avoid creating manually and periodically having to run a report to remove duplicates (from wiki <http://wiki.koha-community.org/wiki/Multipart_Bibliographics> *"There is currently no way to enforce uniqueness in the 001, or rather uniqueness in 001 + 003."*). We have *autoMemberNum* syspref for "next available card number", *autoBarcode* for 952$p, barcode. but nothing for 001, no marc21_field_001.pl vuilder plugin, only bug 9921 <http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=9921> about *"Make it possible to force 001 = biblionumber"*, but that is not exactly what we are looking for. Being this something basic (but asked before <https://lists.katipo.co.nz/public/koha/2010-December/026618.html>) I wonder If I'm getting all wrong... Regards, Pablo BTW on current manual Cataloging Guides say that 001 is "accession number <http://manual.koha-community.org/current/en/catguides.html>", which is usually name to barcode.