Supplier master max field

Hi,

There is an field available as Maximum order value MAXO in supplier master which states below message

"Value above which an order is placed on hold. If you try to enter an order whose total is more than the maximum order value, the system displays an error message."

But when I created the purchase order system is not showing any error message and is allowing to register the PO even order value is greater than max value in supplier master.

Is there any other setup exist to use this. Kindly assist.

Regards,