Description of problem:
When we try to revert the snapshot from Self Service UI we get below error:
"Error reverting snapshot. Operation not supported"

Version-Release number of selected component (if applicable):
5.9.4.7

How reproducible:
Issue can be reproduced on CFME 5.9.4.7 on self service UI.

Steps to Reproduce:
1) Provision a instance from Self Service UI.
2) Create a snapshot of that instance
3) Select the instance and the Snapshots for this instance.
4) Try to revert the Snapshot

Actual results:
"Error reverting snapshot. Operation not supported"

-> Deletion of snapshot works without any issues but reverting fails.

-> On admin portal we do not see snapshot revert option. Only Snapshot delete option is present.

Expected results:
We should be able to revert the snapshot successfully

Additional info: