User mapping for the committer in the Subversion

User's description:

As you can see in the screenshots in the link you refer to Jean-Christophe is the author of the commits. And this works for me as well, but in our case the username "espen" has been used to commit certain stuff and the username "espen" exists in Jira, hence Jira automatically links the commits to the user "espen" in Jira. However the user "espen" in jira is not the author of the commits, the author of the commits has username "espen.b" in jira. We have fixed this in the fisheye "user mapping" so that the correct username shows as the commit author inside fisheye, but when slecting source in jira it says that "espen", not "espen.b" is the author