Toolset Forms parent post selectors allow to connect a post several times in a one-to-one relationship

Symptoms

With Toolset Types you can create one-to-one post relationships that allow connecting exactly one post to another post, but not more.

However, if the posts are added or edited with a Toolset Form that has a parent post selector then you can connect several posts to the same related post.

Workaround

There is no solution for this right now.

Our Developers are aware of the issue and will look into possible solutions.