When Maven2 project is setup to generate the Maven site, Hudson displays
'Maven-generated site' links on the project page. If the project is a
multi-module Maven project then that link points to a site generated for one of
the modules and not the project itself.
Maven will generate the sites individually for every module but links between
parent modules and child modules will only work after the site has been deployed
or staged.
As a suggestion, the 'Maven-generated site' link should point to that module's site.