Prevent user to make changes on the PO after saving

Hello everyone

I would similar to cognize if successful the S/4 Hana nationalist variation it is imaginable to disable definite fields and marque their modification intolerable astatine the point level aft creating and redeeming a acquisition order. If so, however could I bash it?

Thanks successful advance

SAP S/4HANA Cloud Public Edition Sourcing and Procurement