103 field (date of the entity) is typical from french unimarc as it is used by academic libraries It must be add to Koha default auth framework for french locale. http://documentation.abes.fr/sudoc/formats/unma/zones/103.htm Note : 106 field and 128 field are also typical from french unimarc as it is used by academic libraries, but they are already in Koha M. Saby
It looks like bug 18309 hasn't added 103 - maybe because it's SUDOC specific?