Google Structured data testing tool throws warning but it’s a false positive. In isRelatedTo field only product name and URL is required. You can check this in the new Google Rich Snippet testing tool: https://search.google.com/test/rich-results
Still, if you want to remove the isRelatedTo then please add below filter code in his theme’s functions.php file: https://pastebin.com/aYj88Q5j
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.
