I have setup a site with one to may relationships. I have forms in which the user can add or edit childpost. This is working as expected.
However, when I add a child post in the parent post in the backend and fill out the fields, there is no possibility to save the post. When editing an excixiting child post it is working fine.
I have one parent cpt and it has different child cpt's. All one to many relationships.
As long as I work in the front-end i can create a parent-post and i can create or edit child-posts which are associated with that parent.
If i want to do this in the admin section I can see the parent post and in this parent post are the child posts, just as you would expect. I can edit these child posts and save the changes. I can create a new child post but can't save this post. (first picture).
I would like to ensure that this issue is not caused by a plugin conflict and as such I would like for you to temporarily disable all the non-toolset plugins and try again.
I disabled all the plugins and the error was still existing. I enabled them and disabled them again just to be sure and the problem was gone. So it is indeed a plugin.
