Ok so I’m creating a BP Struct to act as a container for some properties/variables…super simple. I’ve created a Struct variable which should be the same type as the containing Struct…so they are nested but for some reason it doesn’t appear in the type dropdown. The type I’m trying to add is ‘RoadNode’ (you can see it exists at the top).
Have a look: http://i.imgur.com/yz69VB6.png
It seems like UE4 does some sort of check/block on nesting structures of the same type no matter now deep they are 
Have a look: Imgur