Receiving on Behalf of Others - Restrict Available POs to a Business Unit

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We have a customer that is using the 'Create Self-Service All Requisition Receiving Receipt' Privilege to allow people to Receipt POs on behalf of others but now want to restrict the available POs/Receipts to particular Business Units.

We have tried using the Manage Data Access for Users to restrict the Employee role to a particular BU but this doesn't appear to work.

Is this functionality available?

Kind regards

Lesley