https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42903

            Bug ID: 42903
           Summary: Mixed-type authority merges should clear 1st indicator
                    in linked bibliographic fields when appropriate
   Initiative type: ---
        Sponsorship ---
            status:
           Product: Koha
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: trivial
          Priority: P5 - low
         Component: Cataloging
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected]
  Target Milestone: ---

Some types of authority records (such as personal and corporate names) require
a 1st indicator in the 1xx field and some (such as topical headings) don't.
This 1st indicator is present in the bibliographic record also. When merging
authority records of the first type into the second type, Koha is not correctly
updating (clearing) the 1st indicator in linked bibliographic fields.

For example, a sample merge might be a corporate authority being merged
into/replaced by a geographic authority. 

110 2_ $aSoviet Union... (1st indicator=2)   > 
151 __ $aSoviet Union... (1st indicator=blank)

Before the merge, bibliographic records linked to the first heading had a
subject field with a 1st indicator of 2.
610 20 $aSoviet Union... 

After the merge those bibliographic records are incorrectly updated to 
651 20 $aSoviet Union...

The 1st indicator of 2 is no longer correct because the new governing authority
record (151 __ $aSoviet Union...) does not have a defined 1st indicator. The
bibliographic record should have
651 _0 $aSoviet Union ...

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