RHEV : Unable to register RHEV-H hypervisor to RHN - Insufficient Software Channel Entitlements: Red Hat Enterprise Linux (core server)

Issue

• Unable to register a RHEV-H node to RHN during installation, following error message given when attempting to configure the hypervisor :

        Error Message:
            Insufficient Software Channel Entitlements:

            hostname  Red Hat Enterprise Linux (core server)

        note: One of the above Software Channel Entitlement(s) are required
        to provides access to: cid6957 Red Hat Enterprise Linux (v. 5 for 64-bit x86_64)
        Error Class Code: 70
        Error Class Info: 
             All available subscriptions for the requested channel have been exhausted.
             Please contact a Red Hat Network Sales associate.
        Explanation: 
             An error has occurred while processing your request. If this problem
             persists please enter a bug report at bugzilla.redhat.com.
             If you choose to submit the bug report, please be sure to include
             details of what you were trying to do when this error occurred and
             details on how to reproduce this problem.

        Error registering to RHN account!