* justify related access points that express relationships (fields 5XX).
* justify related access points that express relationships (fields 5XX).
−
''Note:'' Subfield $v may be used in place of field 670 to justify information recorded in fields 046 and 3XX when it has been defined for this purpose in these fields.
+
''Note:'' Subfield $v may be used instead of field 670 to justify information recorded in fields 046 and 3XX when it has been defined for this purpose in these fields.
''Exceptions:'' It is not necessary to add 670 fields to justify references in the following cases:
''Exceptions:'' It is not necessary to add 670 fields to justify references in the following cases: