Mas 500 V7.4 - Warning for duplicate Customer PO number on SO

We are currently in our testing phase for Mas 500 v7.4 and our customer service team noticed we are now getting a warning stating that...

 

"You have entered a duplicate customer purchase order number.  This customer has already used the same purchase order number on X other orders including the most recent order number XXXXXXXXXX"

 

My question is... is there a way to turn off this warning??

 

For some customers we "reuse" the same customer PO... (ie: PO JOHN) but not on all of them.