How to implement Expense Report review/approval by employees when reports are submitted their assist

We are using PeopleSoft FSCM 9.1 and PeopleTools 8.52 running on MS Windows 2008 R2 servers and SQL Server 2008 R2 Enterprise. We are trying to implement the Expense Report Approval Workflow using AWE in the system. Currently, it is done manually on paper.

We have a situation where many times employees' assistants create and submit expense reports for on employees’ behalf. In such cases, the expense reports should be first reviewed or approved by the employee themselves for correctness before being approved by Expense Manager and Prepay Auditor. I am not able to make it work using AWE configuration (under Setup Financials > Product Related > Expenses > Management > Approval Setup).