When we are upgrading to a higher Solaris 10 update then we have to apply the LU packages from that release media to get the new features otherwise the creation of new Boot Environment will fail, you can refer to the link
http://download.oracle.com/docs/cd/E...zpq/index.html
Also, with every release media there is
liveupgrade20 script which removes the old LU packages and installs them, so we can use this also.
Regards,
Vishal