Purchase Order does not show the Supplier Contact

Summary:

How do make the contact names shown in the PO without associating the Supplier contact to the Supplier address?

Content (please ensure you mask any confidential information):

The supplier has an email address at both the site and contact levels. However, the business wants the supplier's site-level email address to be used for the PO PDF communication. To achieve this, the contacts were not associated with the supplier address. Now, the issue we are facing is the contact names are not showing in the PO due to contact not associated with address.

Version (include the version you are using, if applicable):