R12 Receipt tolerance for existing purchase orders (PO)

Hi Guys,

We have recently changed our receipting options from warning to now show as error, so when users try to over receipt on a purchase order they will not be allowed as the system will generate an error. It's out understanding that this will only effect new PO's going forward and that existing PO's will keep the previous setting of warning only. What like to confirm if this is the case and if so, is there way of updating it for all PO's in the system?

Thanks in advance,

Adam