Our Medical Library is setting up Koha to use as a catalog. Our computer people are working on getting the z39.50 server section to run, but I keep having a problem with item call numbers. We're using MARC21 and Library of Congress Call Numbers (no Dewey or NLM). I got eveything working well enough to the point I was manually loading MARC records, But in trying to fix the problem of no item call number appearing in the catalog, I created another one. When doing a MARC check, I get an error message "The biblio.biblionumber and biblioitems.biblioitemnumber fields must: 1. be mapped in a MARC subfield 2. be in the SAME tag (for expample 090$a and 090$b 3. be in tab -1 (ignore) I'm using 852b for itemtypes and 952 for item information. Since we don't have any personal informaiton on here yet, I could let someone who know's what he's doing take a look at it, though I'd rather figure it out by myself. I'm sure I'll have a lot of other questions in the future. Thanks in advance. The users guide was only so much help. Michael K Chartrand Library Technician Hunter-Rice Health Sciences Library Samaritan Medical Center Watertown, NY 13601 Phone: 315-785-4191 FAX 315-779-5173 email: mchartrand@shsny.com