Can not install `compat-openldap-2.4.19_2.3.43-15.el6_0.2` in Red Hat Enterprise Linux 6

Issue

• Can not install compat-openldap-2.4.19_2.3.43-15.el6_0.2 in Red Hat Enterprise Linux 6.
• Its showing confusing messages while updating the packages.
• Installed package is as follows.

# rpm -q compat-openldap
compat-openldap-2.3.43-2.el6.x86_64

• When trying to update the same, getting the message that there in no update available for compat-openldap

# yum update compat-openldap
Loaded plugins: downloadonly, product-id, rhnplugin, subscription-manager
Updating certificate-based repositories.
tlsv1 alert unknown ca
Setting up Update Process
No Packages marked for Update

• While installing the same package, getting the message that its already installed.

# yum install compat-openldap-2.4.19_2.3.43-15.el6_0.2
Loaded plugins: downloadonly, product-id, rhnplugin, subscription-manager
Updating certificate-based repositories.
tlsv1 alert unknown ca
Setting up Install Process
Package matching compat-openldap-2.4.19_2.3.43-15.el6_0.2.x86_64 already installed. Checking for update.
Nothing to do

• While trying to update directly with version, its showing that the package is available, not installed and no update available.

# yum update compat-openldap-2.4.19_2.3.43-15.el6_0.2
Loaded plugins: downloadonly, product-id, rhnplugin, subscription-manager
Updating certificate-based repositories.
tlsv1 alert unknown ca
Setting up Update Process
Package(s) compat-openldap-2.4.19_2.3.43-15.el6_0.2 available, but not installed.
No Packages marked for Update