Views is a WordPress plugin that lets you display post relationships.
In our user guides, you can find more information on how to display child posts, related posts, brother pages, fields of parents and fields of grandparents.
When you ask for help or report issues, make sure to tell us the type of the relationship you are trying to build and the structure of your data.
When I used up on of the search field with the POST RELATIONSHIP option, it didn't allow me any more when I tried to add another search field... I wanted to confirm if that's how it is or am I doing something wrong?
Solution:
You are right, you can add only one post type relationship filter into "Query Filter" of WordPress Archive or post view
