[Koha-bugs] [Bug 30812] New: subfield 9 deleted if no other data is available

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30812

            Bug ID: 30812
           Summary: subfield 9 deleted if no other data is available
 Change sponsored?: ---
           Product: Koha
           Version: 21.05
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Cataloging
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: domm at plix.at
        QA Contact: testopia at bugs.koha-community.org
                CC: m.de.rooy at rijksmuseum.nl

DNB exports the ISBN with dashes in 020$9, which we import via SRU while
cataloguing.

Therefore we added a subfield 9 to field 020.

But when 020 contains no data except the dashed ISBN in $9, the value of $9 is
deleted.

I assume this is caused by some special cases needed to delete the koha_id of
an authority (which is often stored in $9).

To reproduce:

* Go to a framwork, field 020, add a subfield 9, visible in tab 0, OPAC,
Intranet and edito
* Go to a book, edit it, enter something in 020$a and 020$9, save
* The values are stored
* Edit again, remove the value from 020$a, save
* the value from 020$9 is gone, too

I can maybe take a look tomorrow to try to figure out what's happening..

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