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Cf. http://post-office.corp.redhat.com/archives/tech-list/2011-May/msg00385.html It needs to be explicitly stated in the documentation that there is no path to migrate a system from RHN Classic (channel-based) to Cert-bsed RHN (next gen entitlements).
This is in the 6.1 deployment guide: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/entitlements.html#rhn-v-rhnclassic And 6.1 release notes: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Release_Notes/ar01s11.html Similar text should be in the 5.7 deployment guide and release notes. I'll check and make sure those are properly added.
Verify content from comment#4 is in the docs. Red_Hat_Enterprise_Linux-Deployment_Guide-6-en-US-1-132 Red_Hat_Enterprise_Linux-6.1_Release_Notes-6-en-US-0-42