diff --git a/data/structures/nav-item.yml b/data/structures/nav-item.yml
index 33a6dc0f..84f5a3a4 100644
--- a/data/structures/nav-item.yml
+++ b/data/structures/nav-item.yml
@@ -5,6 +5,7 @@ arguments:
     type: string
     optional: true
     comment: Identification of the item.
+    group: partial
   parentID:
     type: string
     optional: false