Hakan Biroglu has an Oracle Ace blog post on Installing Expense Mobile
Hakan has a great blog post walking thru the process of installing, patching and setting up Mobile Expense.
I'm not sure if I'm allowed to link to a blog post....Hakan is not on Oracle employee, but an "Oracle Ace"
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Hakan Biroglu: How to setup, configure and use PeopleSoft Mobile Expenses & Approvals