Expense Approval for Split Distribution

We are in the process of implementing expense report approval for PeopleSoft 9.2. Our approval definition includes three approval steps: HR Supervisor, a department budget manager or delegate, and Accounts Payable staff. I have the department budget manager set up as Expense Approvers. In the process definition I have selected Some Approvers Required with 1 approver needed. In our environment we often have multiple eligible approvers at the "budget manager" step - a budget manager may delegate his/her approval authority to one or more persons. We require only one of the approvers to take action on the transaction. However, if