How to get Registry ID of a contact person of a Customer?

Summary

Account Site Contacts haven't the Registry ID (aka Party Number) column, is there a way to visualize that?

Content

Hi,

I'm looking on how to manage contact information for Customers at Customer Account Site level.

When creating a contact person, the party number of the contact person is not visible and not available in column field list (also enlarged via Page Composer). Have you a suggestion on how to add this field?

It will be usefull to searh the contact person via Manage Customer UI.

Many thanks

Massimo