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Description of problem:

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/rhn-install-num.html

In section 4.5.5. Migrating a Disconnected System:
As rhel6 do not have installation number, so install-num-migrate-to-rhsm could not be used here and this part should be removed.

Removed the install-num-migrate-to-rhsm script, and only rhn-migrate-classic-to-rhsm  remains.

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/rhn-install-num.html