I think the guideline you want to look at is this one, in the LC-PCC PS for 220.127.116.11:
"Differentiating Authorized Access Points for Persons:
"LC practice/PCC practice: When creating a new authority record for a person, and there are no additions readily available to differentiate the access point in the new authority record, make an addition to the existing authorized access point."
This is not an official communication of the Library of Congress.
William L. Robboy, Librarian
Mexico, Central America & Caribbean Section
Acquisitions & Bibliographic Access Directorate
Library of Congress
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From: Program for Cooperative Cataloging [mailto:[log in to unmask]] On Behalf Of Finnerty, Ryan
Sent: Friday, September 26, 2014 5:45 PM
To: [log in to unmask]
Subject: [PCCLIST] Modify existing AAP to resolve a conflict?
We are having a friendly debate about whether it is still acceptable to modify an existing authorized access point for a person to resolve a conflict when you have no distinguishing information that can be added to the AAP for the new person you are establishing.
The new guidelines on undifferentiated names say that instead of creating an undifferentiated name record "
apply one of the following RDA attributes to create a unique authorized access point for the **person being established**" [emphasis mine]
Our new person has the same name as the existing person and we can find no life dates, fuller forms, titles, other designations, etc. Both authors write fiction so we can't use an occupation like "writer of fiction."
We have dates for the person already established, however PS 18.104.22.168 says not to add dates unless otherwise changing the AAP. It doesn't mention conflict in this particular PS like it does in 22.214.171.124.6 and 126.96.36.199.
We just want to be sure the new instructions on undifferentiated names don't disallow changing an already established AAP in cases such as this.
Ryan J. Finnerty
Head, Database and Authorities Management | NACO Coordinator UC San Diego Library | Metadata Services [log in to unmask]<mailto:[log in to unmask]> | (858) 822-3138