How do I prevent PO Self Service forms from access Third Party Payees in the Locations form in 12.2.

Currently in version 12.1.3 I am able to control access to the Third Party Payees in the Locations from the PO forms (PO, PO Summary, Requisition, Requisition Summary) with the custom.pll. This will not work in 12.2.4 as it has introduced may HTML/Self Service forms in iProcurement, Sourcing and the Buyer's Workbench. Has Oracle or other customers come up with a solution for protecting Third Party Payees information from in SCM forms? I would appreciate any MOS notes or help with this.

Thank you! Jennifer