Update from offline local repository with a predefined release.

Hi all,

i have a lab which is consisted of 3 servers. One as management (No internet connection. Acts as offline repository), one as remote (No internet connection) and one for getting all the latest updates from RHN (Online updater).

I would like to keep the remote one updated on a specific version (7.2) by "locking" it's kernel's release using the following commands:

subscription-manager --release=7.2
yum clean all

It's .repo files stored in "/etc/yum.repos.d" are edited and the baseurl points to management servers' HTTP server where all the latest repo packages are residing (after transferred from online updater).

Problem:
Even though all machines have been registered with a valid RHEL Server EUS subscription and even though release is set to 7.2, when remote is updated it's kernel gets upgraded to 7.5.

Notes:
I have removing the contents of folder "/var/cache/yum" and then "yum clean all" but result is the same.

Is the feature of setting a RHEL release working only when updating while being online and downloading from RHN?

Any help would be appreciated.

Thanks