First, I want to use search in the view based on the parent post field. I tried to add the field but the search is not working.
Second, I want to add grand parent field in a view. When adding the field it will not show any value.
As a result, if you'll use the second "Reserve" link on the page "/?enginvitems=test-location-cs", you'll see that the department field value will be populated correctly.