Do Approval User List in Expenses still required Application Class and Role/SQL need a customization

I am setting PS Expenses 9.2 following Oracle setup manager guidelines. When setting up Approvals, Use Lists I read in PeopleBook Expenses, Chapter 10 this "Note: PeopleSoft Expenses delivers an approval and workflow configuration as part of system data. You can activate or inactivate transactions and approver types to match your business requirements. Oracle's PeopleSoft recommends that you manage your approval rules only through the PeopleSoft Expenses configuration pages; otherwise, modifications to the Approval Framework configuration data could disrupt approval routing. PeopleSoft Expenses only supports user lists based on Application Class. Using other user list sources may require customizing your system" I setup mu User lists using application class but is not working. My tech team wants to use Roles, the customer doesn't want a customization and I need to verify it through Oracle. Can someone please help me. I am going live in 3 months and I am stuck on approval setup. Thanks :-)