Impossibilty to create an User who has the same account name as a group

Hi everyone,

I've just noticed it's impossible to create an User who has the same account name as a group. To create an User, I use the form allowing us to do this kind of things in the administration application.

For example, if we have a group named Writer, it's impossible to create an User named Writer. There is not error message displayed when we validate the form in order to create that User but there is an error in the TomCat log. The error is :

• http://.../xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=Users [http-8080-Processor23] ERROR web.XWikiAction - Connection aborted
• http://.../xwiki/bin/inline/XWiki/Admin?xpage=edituser [http-8080-Processor24] WARN filter.MacroFilter - MacroFilter: unable to format macro: rss
  java.io.IOException: Error processing http://www.xwiki.org/xwiki/bin/view/Main/BlogRss?xpage=rdf: Connection reset

Hesediel.