We know about bug #1718944 which prevents to use guaranteed CPUs. Comment 12 mentions a woraround: https://bugzilla.redhat.com/show_bug.cgi?id=1718944#c12 We should document this as a known issue
The content associated with this bug was published in the CNV 2.0 Release Notes: https://docs.openshift.com/container-platform/4.1/cnv/cnv_release_notes/cnv-release-notes.html