What is the function of the "itemnumber" field in the "items" table in Koha? Where does it come from? How is it used? In the MARC/Koha cross reference document on http://www.koha.org/wiki (which I realize is woefully out of date) the "itemnumber" field references MARC tag 890, subfield "c", which, as far as I can tell is not used elsewhere in Koha. In fact, neither MARC21 nor UNIMARC define tag 890 at all (see http://www.loc.gov/marc/bibliographic/ and http://www.ifla.org/VI/3/p1996-1/sec-uni.htm for tag definitions under MARC21 and UNIMARC, respectively). I have tried to put together a cross reference spreadsheet based not only on the cross reference document noted above, but also by reference to fields defined in Koha. Any information I can get on this or related questions will be appreciated. Thanks, Tom Madron Tom Madron Enterprise-Wide Computing, Inc. 1023 15th Avenue, South Nashville, TN 37212 Telephone: 1-615-259-2771 URL: http://www.ewcnet.com mailto:tmadron@ewc-inc.com