[Koha-bugs] [Bug 13760] New: Authorities merge sometimes create duplicate fields in biblio

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13760

            Bug ID: 13760
           Summary: Authorities merge sometimes create duplicate fields in
                    biblio
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Cataloging
          Assignee: gmcharlt at gmail.com
          Reporter: fridolyn.somers at biblibre.com
        QA Contact: testopia at bugs.koha-community.org
                CC: m.de.rooy at rijksmuseum.nl

When merging two authorities the biblio records linked to those authorities are
updated. It is directly done if syspref "dontmerge" is on "Do".

Actually some cases create a duplicate field.
For example, a biblio record as : 
  600 $9 11 $a Son Goku
  600 $9 12 $a Vegeta
If you merge the authorities id=11 and id=12 into id=11 (creating Gogeta), you
actually get :
  600 $9 11 $a Son Goku
  600 $9 11 $a Son Goku

Having two identical fields linked to the same authority is useless.

The same problem is even more frequent when merging two authorities of
different type.

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