Approval of Expense Report Top Hierarchy Position

Summary

Expense report errors out due to no manager for top hierarchy position

Content

How have others done this.  Scenario: our City Manager is the top hierarchy level and does not have a manager.  Expense report was created and we use the line manager as the approval of expense reports, standard delivered approval routing.  Expense report immediately errors out due to missing hierarchy position.  Cannot manually reassign from Worklist Admin tasks as the expense report is immediately returned to 'not submitted' status.  Looking for advice on how to make this work or suggestions on how reimbursements are done for top level mgmt in hierarchy.