When this sort of complicated feeling exists, we suggest adding a cautionary note.(Spin-off of "How an Application Form Should Look (Expense Report Sample)")
[Expense Report <Notes - HTML Form>: "1b. Confirm" screen]
Furthermore, adding necessary communications and cautionary points (company rules, etc.) in each task screen will help the workflow's smooth sailing.
[Expense Report <Notes>: "2. Approve Expense" screen]