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I am trying to create a Reviewing System for a 'Parent CPT'. I have created a 'Child CPT for Reviews' and a 'Child CPT for Reviews Post Form' which, among others, contains a selector for the 'Relationship Parent CPT - Child CPT for Reviews'. I have added the 'Child CPT for Reviews Post Form' on the 'Layout for Parent CPT', but you still have to select the Parent manually. The Parent post is not automatically preselected as I thought it would be as per supporting documentation.
Yes, it is possible to setup the current parent post as default value of the relationship field, you just need to setup the "value' attribute as current post ID: [wpv-post-id id="$current_page"], for example: