FIX: added missing prefix

src/core/js/edit_mode.js

@@ -75,7 +75,7 @@ var edit_mode = new function() {
 		e.preventDefault();
 		var entity = $(this).parent();
 		edit_mode.app.startEdit(entity);
-		edit_mode.add_dropped_parent(e, app.entity);
+		edit_mode.add_dropped_parent(e, edit_mode.app.entity);
 	}
 
     this.add_new_property = function(entity, new_prop) {