[Koha] Link field authority

[Victor Barroso Oliveira]

Good,
I created a new field MARC 697 – local subjectc
I also created a “local subjectc” authority type and then linked it to
field MARC 697.
I imported some records and authorities with the information into the
appropriate fields.
I ran the misc/link_bibs_to_authorities.pl script to link the authorities
with the records information.
Fields 650, 100, etc. were linked normally, but field 697 was not linked.
Is this a bug in the system?
Is Koha not linking newly created MARCS fields?