I need Help with credits

I created a field “Personnel” in my files for a release and added “James Martin - Bass” as suggested in this article https://help.roonlabs.com/portal/en/kb/articles/file-tag-best-practice
The thing is that James Martin becomes Jim Martin in Roon and links to a different artist.
How can I correct this?

Can you not go to album edits > Credits, uncheck the wrong Jim Martin, search for the correct James Martin, and add him?