In the process of cleaning up data to prepare for a batch upload into Koha, I have noticed that some of our ISBNs are not unique. These are books from small independent publishers who forgot to change the ISBN when they issued a new book. I'm happy to leave them in the ISBN field (020a ) as long as this won't cause problems in Koha. Looking at the framework it is also tagged as biblioitems.isbn. I know record matching uses ISBN. Does anyone know if the contents of this field must be unique? Thanks -- Elaine Bradtke Data Wrangler VWML English Folk Dance and Song Society | http://www.efdss.org Cecil Sharp House, 2 Regent's Park Road, London NW1 7AY Tel +44 (0) 20 7485 2206 (This number is for the English Folk Dance and Song Society in London, England. If you wish to phone me personally, send an e-mail first. I work off site) -------------------------------------------------------------------------- Registered Company No. 297142 Charity Registered in England and Wales No. 305999 --------------------------------------------------------------------------- "Writing about music is like dancing about architecture" --Elvis Costello (Musician magazine No. 60 (October 1983), p. 52)