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

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

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

--- Comment #8 from Marcel de Rooy <m.de.rooy at rijksmuseum.nl> ---
(In reply to Jacek Ablewicz from comment #6)
>    700 $9 11 $a Son Goku $t Aaa Bbb
>    700 $9 12 $a Vegeta $t Ddd Ccc
>    700 $9 12 $a Vegeta $t Eee Fff

> While having 2+ $9 links to the same
> authority record from one biblio record is probably not very common
> (depending on the material type, local cataloguing rules etc.), AFAIK this
> can happen occasionally and in such cases it's not always necessarily an
> error and/or a duplicate.

Can anyone confirm that this case is a valid one with reference to cataloguing
rules etc.?

This discussion comes up actually on several of the reports in this category.
Suppose that we would have a 'strict' merge mode and a 'loose' merge mode, that
either removes all extra subfields or leaves them untouched in the biblio
record while merging, would that be sufficient? See also the AuthCleanBiblios
pref of bug 5572; I would btw rather call it something like AuthorityMergeMode.

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