diff --git a/modules/restapi/src/main/resources/docspell-openapi.yml b/modules/restapi/src/main/resources/docspell-openapi.yml
index 8fdfd848..dcc81815 100644
--- a/modules/restapi/src/main/resources/docspell-openapi.yml
+++ b/modules/restapi/src/main/resources/docspell-openapi.yml
@@ -4483,6 +4483,8 @@ components:
         dueDateUntil:
           type: integer
           format: date-time
+        itemSubset:
+          $ref: "#/components/schemas/IdList"
     ItemLight:
       description: |
         An item with only a few important properties.
diff --git a/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala b/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
index 1def28d4..4e872606 100644
--- a/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
+++ b/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
@@ -134,7 +134,9 @@ trait Conversions {
       m.dueDateFrom,
       m.dueDateUntil,
       m.allNames,
-      None,
+      m.itemSubset
+        .map(_.ids.flatMap(i => Ident.fromString(i).toOption).toSet)
+        .filter(_.nonEmpty),
       None
     )