POWL results restriction

Hello

We have implemented SRM 7 in stand alone scenario.

I would like to know how to restrict the POWL results based on company code or purchasing organisation. SRM will be used by users from multiple countries and now all the users are able see all the results. POs/Invoices from other companies are visible in the POWL.

How do we restrict this per company?

Regards

Zubair