4XX and 5XX Fields (Section II: Additions and Changes to Authority Records)
4XX and 5XX fields on existing LC/NAF records may be added, deleted, and/or modified for various reasons, including:
deleting a 4XX/5XX field because it is no longer appropriate
modifying a 4XX/5XX field in order to reflect new information or make a correction
adding a new 4XX/5XX field because a variant form of the heading has been encountered
1. For guidelines on how and when to add or modify 4XX/5XX fields, see:
AACR2, chapter 26
LCRIs for chapter 26
DCM, Section Z1
2. Many modifications to 4XX/5XX fields will also necessitate the addition of 670 and/or 675 fields.
3. When adding or adjusting 4XX/5XX fields on an authority record, remember that the whole record must be brought up-to-date. Examine and, if necessary, adjust all 4XX/5XX fields in the record. Code the Reference evaluation fixed field 008/29 appropriately.
4. Do not delete or change linking references in existing authority records except in cases of conflicts that cannot be resolved by additions to the other heading.
See also: