[Koha-bugs] [Bug 29252] New: Document the uses of 942c (MARC21)

[bugzilla-daemon at bugs.koha-community.org]

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 at lists.koha-community.org
          Reporter: caroline.cyr-la-rose at inlibro.com
        QA Contact: testopia at 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

------------

>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.

--------------------


>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

---------------------

>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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