"EAP5 repository is still enabled. Please disable EAP5 repository before you continue" error when upgrading RHEV-Manager

Issue

When starting the rhevm-upgrade script, following error appeared:

[root@host /]# rhevm-upgrade           
Loaded plugins: product-id, rhnplugin
This system is receiving updates from RHN Classic or RHN Satellite.
Info: RHEV Manager 3.0 to 3.1 upgrade detected
Checking pre-upgrade conditions...(This may take several minutes)

Warning: the following packages will be removed if you proceed with the upgrade:
 * objectweb-asm
Would you like to proceed? (yes|no): yes
Error: EAP5 repository is still enabled. Please disable EAP5 repository before you continue.

RHEV 3.0 and jbappplatform channels were removed, as recommended in the https://access.redhat.com/site/articles/269333 article:

# rhn-channel --remove --channel=rhel-x86_64-server-6-rhevm-3
# rhn-channel --remove --channel=jbappplatform-5-x86_64-server-6-rpm

Problem still persists.