Latest Iteration is a direct pick but need to use a relatively obscure Sub Select technique to get Latest Revision.
This is primarily because Revision series can be anything.
See attached example.
[cid:image001.png@01CF5E02.B4E4C1F0]
[cid:image002.png@01CF5E02.B4E4C1F0]
[cid:image003.png@01CF5E02.B4E4C1F0]