Description of problem:
Package available in both RHEL and EPEL repository

So, this package should not be present in EPEL-6.



# yum  info perl-Test-Exception
Loaded plugins: fusioninventory-agent, rhnplugin
Available Packages
Name       : perl-Test-Exception
Arch       : noarch
Version    : 0.27
Release    : 4.1.el6
Size       : 20 k
Repo       : epel
Summary    : Library of test functions for exception based Perl code
URL        : http://search.cpan.org/dist/Test-Exception/
License    : GPL+ or Artistic
Description: This module provides a few convenience methods for testing exception
           : based code. It is built with Test::Builder and plays happily with
           : Test::More and friends.

# yum  info perl-Test-Exception
Loaded plugins: fusioninventory-agent, rhnplugin
Available Packages
Name       : perl-Test-Exception
Arch       : noarch
Version    : 0.27
Release    : 4.1.el6
Size       : 20 k
Repo       : epel
Summary    : Library of test functions for exception based Perl code
URL        : http://search.cpan.org/dist/Test-Exception/
License    : GPL+ or Artistic
Description: This module provides a few convenience methods for testing exception
           : based code. It is built with Test::Builder and plays happily with
           : Test::More and friends.

So package from EPEL is selected first and ovverride RHEL official package.


And more critical The package in EPEL is different

# rpm -qlp perl-Test-Exception-0.27-4.1.el6.noarch.rpm-from-RHEL
...
/usr/share/perl5/Test/Exception.pm

# rpm -qlp perl-Test-Exception-0.27-4.1.el6.noarch.rpm-from-EPEL
...
/usr/share/perl5/vendor_perl/Test/Exception.pm

(the package from EPEL seems broken, but perhaps because I use it in mock against the RHEL-6 beta repository)