We have been copying the bib record call number (090, 092, etc. ) into the item record for the last couple of years. This was started as a way to preserve the call numbers should the information in the bib record be overwritten. Prior to that we would have an indexed call number in the item record only if the call number was different from what was in the bib record. Now the majority are duplicates of each other. Both are being indexed in the call number index.
Since both the bib and item call numbers are indexed this is causing some issues with duplicate call numbers showing up in the catalogue, on inventory lists, call number statistics. We aren’t sure if we should continue this practice or if there is another way of preserving the information. We are wondering what other libraries are doing and if there’s any advice you could share?