When using import profiles for EDI ordering you must add the "retain 020" field in order for the 020 to overlay onto an existing bib record when ordering additional copies. This is annoying because each time you reorder, another 020 line gets stamped into the bib - adding more lines for Cataloging staff to delete when the item comes in.

If you remove the "retain 020 tag" no more duplicate 020s get stamped onto the bib, but also any new-to-the-bib 020 also does not get added. This is a problem especially with AV, where some vendors use a 020 tag in their EDI ordering process. An example would go like this:

• Music CD ordered from a vendor that does not use 020 in music records. The record has no 020 tag, but does have a 024 tag -Same music CD is reordered from a vendor that does use 020 in music records, and sends them as part of their .mrc file -Without retaining the 020 tag, the music CD matches on the 024 (good), but then does not add a 020 tag to the bib record -Because the vendor requires an 020 tag to match on their system, the EDI order to the vendor fails