Purchasing Document Header Database Resource conditions not working as expected

Summary:

When modifying Data Access Security Policy at role level for Database Resource "Purchasing Document Header" and setting it at "Select by Key" and providing a PO Header ID as parameter. Its not working as expected. User is still able to query all Purchase Order for the Procurement BU attached to Buyer profile.

Ideally, user should be able to access any PO apart of what has be provided as PO Header ID in DAS policy.

Is there any way to restrict access to purchase document based on some values.

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