I have an old website which uses the post 2 posts plugin (https://wordpress.org/plugins/posts-to-posts). The plug in has been used to set up many relationships between custom post types.
However I am now in the process of creating a new version of this website from scratch. I therefore have exported and imported all posts, custom posts and ACF data. However the export / import did not include the relationship data of each post.
My question is how can I export the post relationship data that was created using "post 2 posts" from the old site to new site?