Drupal: Workflow and Revision Moderation modules don't play together 2007-07-02
Besides the Revisions Moderation module of Drupal needing a fix before it works, it won’t work with the Workflow module as most people would like or expect:
The Workflow module will only work for the most recent/approved revision. So if you, for example, have a “live” and a “draft” status in your workflow, where the move from “live” to “draft” will unpublish the node, it will become inaccessible for everyone else; not only the revision, as you might expect or hope.
Someone might need to work on this.