Maybe I don't understand exactly how to make it work.
For example I have set a relationship between 2 custom post types "Member" and "Mission".
I have checked the box "reciprocal relationship"
I created a custom field on each post using the same name and same id for both custom fields.
In the "mission" Custom Post Type it is a "Post" select with post type filter "member".
In the "member" Custom Post Type it is a "Post" select with post type filter "mission".
When I add a mission for the member, it is recognized on the member profile but not on the mission page.
How to fix it ?
I already disabled plugins that might have conflicts.
I emptied the cache.
I also renamed afterwards the custom field on both Custom Types using the Relationship field ID.
Thanks,