Users are able to link new individual and organization relationship records to existing non-constituent records. When linking a new organization relationship to an existing non-constituent organization record, users are unable to search for the non-constituent relationship record by address fields. The address fields do not carry over in the search window and they do not populate the new relationship record.
We are currently evaluating this issue and will update this article when we have more information.
Search for the non-constituent relationship by the organization's name, and manually add the address to the relationship record.