Receipts - Minimum Amount

Hello-

My goal is to require receipts for line items over $25.00.  Per Peoplebooks I went to

Set Up Financials/Supply Chain, Business Unit Related, Expenses, Expenses Definition, Receipts

Required....

I set the Minimum Receipt Amount to $25.00 - see attached.  I then proceeded to submit an expense report with a line item greater than $25.  There was no error/warning, etc.  Did I miss a step?  Or does the validation occur at the time of payment?  Or with the approver?

Or do I need to do something for the configuration to take effect -- like bounce app server, etc?