Same user is able to create and approve expense report

Our company is currently utilizing PeopleSoft Expenses 9.2, image 12.  We have identified situations in our system where one user is able to create and approve the same expense report, in this situation the expense report is submitted by a separate employee.  For example, Employee A reports to Employee B, Employee B creates an expense report on behalf of Employee A, Employee B saves the expense report, Employee A submits the expense report and it is routed to Employee B for approval.  Employee B is able to access the expense report and approve it even though they were the original