We need to restict data access for other BU

Hi Team,

We must restrict access to the SFA BU service request data, which implies that SFE BU users are not permitted to view the SFA data.

For this we copied the customer service representative standard role and end dated the service request related data security policies.

and we created a rule in access group to restrict the SFA data.But SFA data is still visible to the SFE users.

Please give me some advice on how to restrict the SFA data.

Thanks,

Thirumala Rao