Why doesn't ending the effective date on a supplier/Item record prevent purchase orders from process

We noticed recently that if a supplier/item relationship has a past due expiration date, the system will still allow the order to process.  Is there any way to prevent that?  I also read in the documentation that having Processing Option 5 (Supplier Analysis) on the Interface tab on P4310 allows supplier/Item relationships to auto-create upon initial purchase order creation.  Is there a way to prevent to auto-creation of supplier/item records while still capturing Supplier/Analysis data?