Expense Report Approval workflow

 Currently, if an expense reports contains policy violation, there will be a warning message in manager's notification, but manager can approve it directly. But if an expense reports contains missing receipts with missing receipts box  checked, there will be a warning message also to alert manager that the expense report contains missing receipt, but in this case, manager can't approve it directly, he/she must key in some notes in message box prior to click the approve button.

I would like to know is this an Oracle standard functionality or customize function? I'm a newbee in this workflow functionality.

Thanks,