The design is to allow the user to easily set up sets of specification requirements that will appear on the Purchase Order document associated with a particular product. So when placing a PO you can select for example “We are buying with our default set of spec requirements” and those specification requirements will appear on the Purchase Order automatically. Or, we are buying our “higher grade” set of spec requirements which is a different set of requirements that would appear on the PO instead. Screen show below shows how you set up these Purchase Standard specifications:
During Purchase Order creation you would select the specific set of specification standards that you want to apply on this purchase order.