How do I prevent Purchase Order items in the Receipt Routing (Inspection) process from appearing in

I am tasked with creating a First Article process.  I have a unique Purchase Order type with item that is going through Receipt Routing (Inspection).  The item is appearing in Work With Supply and Demand (P4021) in the Supply column - but I don't want it to.  I have the Processing Option of "Supply/Demand Inclusion Rules" set to S&D.  The Purchase Order type is excluded from the S&D Inclusion Rules.  The item quantity correctly doesn't appear as Quantity on Hand or in Item Ledger until it has completed the Receipt Routing process.

I don't understand how the Purchase Order type can be excluded from the S&D Inclusion Rules, yet appear in P4021 when the version is referencing the S&D Inclusion Rules.  Please help.