Why is there no validation to stop supplier site deactivation when there are in-flight POs?

Summary:

We have the situation where supplier sites are being deactivated for genuine reasons e.g supplier has moved so old supplier site and address is deactivated. The supplier sites may be used on inflight POs so when we try to receipt the POs, a validation error is thrown as the supplier site on the PO is inactive. Why does Oracle allow a supplier site to be deactivated when there are inflight POs?

Content (please ensure you mask any confidential information):

Is there someway to turn on validation to stop the deactivation of a supplier site if that site is used on inflight POs?