How does the Buyer Update the Stockless flag on a PO?

PeopleSoft Inventory and Purchasing. We're on 9.2, PUM 44, Tools 8.59.11.

What I'm curious about is Stockless PO lines. We have items setup with the Stockless flag checked on the Purchasing Item Attributes page but not on the Item Supplier page as we want the items to source to the Storeroom when ordered through ePro. Our users do have the ability to check the Override Supply Room checkbox for Inventory Items though.

We allow our Buyers to force POs for items as needed and this is where the issue occurs. If the Buyer creates a PO for an item that is flagged as an Inventory Item they cannot change the Stockless flag to checked on the PO line. I swear this was something they had access to change at one point but it's been at least since PUM 40 that it seems they can't access this flag. This is causing issues because the PO line is treated as incoming qty for the storeroom and the BUSINESS_UNIT_IN is populated on