Default Expenditure Organization, Expenditure Type and Expenditure Date on PO Distributions

We are using Projects (Project Driven Supply Chain) for Inventory tracking. We are not using projects for Project Billing and Project Costing. When creating Purchase Order, user will enter the Project Number and Task Number. But we want the Expenditure Organization, Expenditure Type and Expenditure Date to be auto populated as each field will always have one static value irrespective of Item, Item Categorty, Business Unit, Organization, etc. Infact, if there is a way where these fields are not even required since we are not using Oracle Project Costing/Billing, then even that should work.

So can we achieve this on Purchase Order distributions and other similar Inventory transactions?