Procurement - Why access to purchase orders is not restricted by Requisitioning BU?

Hello,

Currently in Oracle version 25B (11.13.25.04.0) , there is no security of data across Requisition business units, and users can view and edit purchase orders beyond their intended scope.

Having a common Procurement Business Unit that is serving more than 6 Requisition BU (but intended to increase by 5 to 10 new requisition BU each year), there is a business need to restrict access to the Purchase Order based on their Requisitioning BU when creating or managing them through standard page.

We have shared referential (Item, Blanket Purchase Agreement contract and Supplier) at procurement BU level that can not be duplicated, as it is unique group referential common data.