The MARC 21 Authority documentation for field 678  has a title "678 - Biographical or Historical Data (R)". This seems to indicate that the field should be repeatable, and looking at older documentation (from the 1990s), this does not appear to have changed recently. However, in Connexion if I try validating an authority record with more than 1 678, I get a message "678 - occurs too many times". I didn't see any other mention of the 678 not being repeatable, so I'm wondering why Connexion's validation doesn't allow more than 1 678 to be present.
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