iExpense - Final Approver

One of the employees has created expense report for a cost center by mistake, for which no approval/signing limits exists for none of the supervisors in the approval hierarchy including the top employee.  The Workflow moved all the way thru the approval chain and final when it is approved by the top employee, the status changed to ready for payment.

Could you clarify is it the intended functional of the iexpense approval workflow, when it reaches the final approver, regardless whether signing limits exists or not if he approves, it will be ready for payment.