https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=29252 Bug ID: 29252 Summary: Document the uses of 942c (MARC21) Change sponsored?: --- Product: Koha Version: master Hardware: All OS: All Status: NEW Severity: enhancement Priority: P5 - low Component: Documentation Assignee: koha-bugs@lists.koha-community.org Reporter: caroline.cyr-la-rose@inlibro.com QA Contact: testopia@bugs.koha-community.org There was a discussion on the mailing list about the reasons of 942c. See this thread : https://lists.katipo.co.nz/pipermail/koha/2021-October/056838.html

Good afternoon,

I recall reading (in the Koha manual?) the explanation for why it is advantageous to define Koha item type in the bib 942 field. I believe it has to do with exporting records, or the scope of records that is included when doing some type of report? I'm trying to locate that information again, but can't find it for the life of me.

Does this seem familiar to anyone? Thanks.

Tasha Bales

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I can't find the information right now, though I know I've seen it somewhere.

My understanding is when importing a MARC record, 942$c is treated as the item type in the bibliographic record, and 952$y is the item type for the item record (assuming a 952 holding field was present).

I have also observed that when you create a new item record from an existing bib record, 942$c gets copied into the new item's type. So it's helpful to make sure that the item type in the bib record was set correctly when it was created (or imported).

This wiki page talks about 952, but not 942:

https://wiki.koha-community.org/wiki/Holdings_data_fields_(9xx)

I'm sure someone more knowledgeable can correct this if I'm wrong.

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942$c - defines the type of material the bibliographic record represents, sort of like it's GMD (general material description). Has no bearing on circulation of material. Stored as marcxml in biblio_metadata.

952$y - defines the item-level item, and is used mandatorily for Koha's circulation rules which work as a permutation of (a) branchcodes (b) patron categories and (c) item-level item types. Stored as itype column in items table.

Hope this helps Indranil

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952$y is mandatory for circulation IF item-level_itypes is set to "specific >item". Otherwise, 942$c is used as the item type for circulation.

Another thing that I have observed about 942$c is that it is indexed for the >search in the same way as 952$y. So if you have records without items (for >journal articles, websites or ebooks for example), these will still be >searchable through the item type filter.

Also, if 942$c and 952$y are not the same in one record (for example, 942$c is >Book and 952$y is Reference), they will show in the results of a search for >either type.

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