Drag and drop - force all drag items before submitting

Hi all,

I haven't been able to find an answer to this, so here we go!

I have a drag and drop interaction (free form). I'm wondering if it's possible to force the learner to move all the drag items to targets before they can submit for grading?  Currently, if they don't drag all the items to targets, the question is just marked as incorrect.  

I've been playing around with a layer that is triggered on the submit button, with the condition that the drag items are not in a "drag and drop correct" or "drag and drop incorrect" state, but the layer comes up every time.

Attached the slide here and would appreciate some help!  Thanks! :)

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