https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42694

            Bug ID: 42694
           Summary: Koha produces extra authorities for OCLC fast subject
                    headings
   Initiative type: ---
        Sponsorship ---
            status:
           Product: Koha
           Version: 24.11
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P5 - low
         Component: Cataloging
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected]

This applies to anyone who imports Marc21 records in the English-speaking
world, and who might have standard Library of Congress subject headings, as
well as OCLC fast subject headings.

After more extra, manual work, the result of what I'm talking about looks like
this:
650 _ 0 ‡aMiracles.‡9133027
650 _ 7 ‡aMiracles.‡2fast‡0(OCoLC)fst01023535‡9200794

As this is fairly complicated to explain I have created a screencast (apologies
for the low level of sound):

https://youtu.be/4hZexR4vmjs

What Koha did with the imported bibliographic record's lines

650 _ 0 ‡aMiracles.
650 _ 7 ‡aMiracles.‡2fast‡0(OCoLC)fst01023535


650 _ 0 ‡aMiracles.

was initially not synched to the existing "Miracles" subject in local
authorities

and for
650 _ 7 ‡aMiracles.‡2fast‡0(OCoLC)fst01023535

Koha added an additional OCLC fast subject heading for "Miracles".

This meant that there was a third entry for "Miracles" in our authorities.

As you can see I could in the video, this can be fixed manually, but this
should not be solution. Also, I don't think that one should tell Koha
cataloguers in the English-speaking world who use Marc21 to not use the OCLC
fast subject headings, which would probably solve the problem).

For a while, I had suspected that Koha does this, as I have repeatedly fixed
the same, duplicate authorities, in the last 6-8 months, since moving to Koha.

This is really a serious inefficiency, and could put off any cataloguer from
Koha. 

Maybe currently Koha does not really look at the indicators (second indicator 0
= Library of Congress, second indicator 7 = scheme specified in subfield 2).
Maybe that would be a starting point for allowing several entries with the same
basic string of of characters, whilst the actual entry is different...?

I would be grateful if other Koha cataloguers in the Marc21 / English-speaking
world would like into this, and if I'm missing a solution, please let me know.

Many thanks for considering this,
Clemens

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