rpm install not recognized by yum.

one of our servers had the pgdg rpms (8.2.4) installed by hand. now
that the yum repo is available, i installed
pgdg-redhat-8.2-4.noarch.rpm. this is on
redhat-release-5Server-5.2.0.4. i do a yum update and the rpms are not
being recognized. how come? also when i performed yum clean all i get
the message "Repository pgdg82 is listed more than once in the
configuration". although i only see one declaration of pgdg82, the
other is pgdg82-source. Anyone have this issue?

# cat /etc/yum.repos.d/pgdg-82-redhat.repo
[pgdg82]
name=PostgreSQL 8.2 $releasever - $basearch
baseurl=http://yum.pgsqlrpms.org/8.2/redhat/rhel-$releasever-$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG

[pgdg82-source]
name=PostgreSQL 8.2 $releasever - $basearch - Source
failovermethod=priority
baseurl=http://yum.pgsqlrpms.org/srpms/8.2/redhat/rhel-$releasever-$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG