Re-Envisioned › Support › MB Relationships › Display meta data from one post on connected posts edit pages › Reply To: Display meta data from one post on connected posts edit pages
If all you want is just displaying customer info on the invoice edit page, then you can use a custom field
custom_html to get their data and show. These data should be for customers, they are custom fields for customers. On the invoice edit page, you simply make a query and get the info.