Expense Entry - Limit User to only allow enter expense reports for themselves and/or delegates

Hello,

We are upgrading from PeopleSoft 9.1 PT 8.51 to PeopleSoft 9.2 PT 8.55 and implementing delivered expenses module.  We are currently using a custom expense module.  Is there a way to configure or setup security to only allow employees to enter expense reports for themselves and their delegates?  We are seeing that when you navigate to Travel and Expenses > Expense Report > Create/Modify that users are able to select any employee to create an expense report.  What is needed to implement this?  Has anyone else come across this issue?  What have you done to resolve?

Thanks,

Linda