# for an authority to be searched subfield $9 in the
# for cataloging purposes. following: 700,701,702,710,
# 711,712 and some 6XX fields (Unimarc)
-Authority-Number 1=8910
+# 8910
+Authority-Number 1=Koha-Auth-Number
an Authority-Number
Koha-Auth-Number Authority-Number