Currently, workflow field updates that run based on an approval process or time-dependent action do not trigger any rules. This is frustrating because you can not add criteria to actions, only the approval steps. I thought a workaround would be to create a workflow rule outside of the approval process, but this does not work either. It would be nice to have criteria for the approval/rejection actions as well as have rule trigger when a field is updated, regardless of whether or not it is from an approval process are time-dependent action.