diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentPrefetchRepositoryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentPrefetchRepositoryImpl.java
index 4f056c8..c187f20 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentPrefetchRepositoryImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentPrefetchRepositoryImpl.java
@@ -94,7 +94,7 @@
             final FragmentEntity fragmentEntity = new FragmentEntity();
             fragmentEntity.setId(resultSet.getLong("id"));
             fragmentEntity.setXpath(resultSet.getString("xpath"));
-            fragmentEntity.setParentId(resultSet.getLong("parentId"));
+            fragmentEntity.setParentId(resultSet.getObject("parentId", Long.class));
             fragmentEntity.setAttributes(resultSet.getString("attributes"));
             fragmentEntity.setAnchor(anchorEntityPerId.get(resultSet.getLong("anchorId")));
             fragmentEntity.setChildFragments(new HashSet<>());
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index cd70cf8..3f672ad 100755
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -39,6 +39,7 @@
 Bug Fixes
 ---------
 3.3.6
+    - `CPS-1841 <https://jira.onap.org/browse/CPS-1841>`_ Update of top-level data node fails with exception
 
 Features
 --------
diff --git a/integration-test/src/test/groovy/org/onap/cps/integration/functional/CpsDataServiceIntegrationSpec.groovy b/integration-test/src/test/groovy/org/onap/cps/integration/functional/CpsDataServiceIntegrationSpec.groovy
index 9716cb5..82a415e 100644
--- a/integration-test/src/test/groovy/org/onap/cps/integration/functional/CpsDataServiceIntegrationSpec.groovy
+++ b/integration-test/src/test/groovy/org/onap/cps/integration/functional/CpsDataServiceIntegrationSpec.groovy
@@ -394,6 +394,17 @@
             restoreBookstoreDataAnchor(1)
     }
 
+    def 'Update bookstore top-level container data node.'() {
+        when: 'the bookstore top-level container is updated'
+            def json = '{ "bookstore": { "bookstore-name": "new bookstore" }}'
+            objectUnderTest.updateDataNodeAndDescendants(FUNCTIONAL_TEST_DATASPACE_1, BOOKSTORE_ANCHOR_1, '/', json, now)
+        then: 'bookstore name has been updated'
+            def result = objectUnderTest.getDataNodes(FUNCTIONAL_TEST_DATASPACE_1, BOOKSTORE_ANCHOR_1, '/bookstore', DIRECT_CHILDREN_ONLY)
+            result.leaves.'bookstore-name'[0] == 'new bookstore'
+        cleanup:
+            restoreBookstoreDataAnchor(1)
+    }
+
     def 'Update multiple data node leaves.'() {
         given: 'Updated json for bookstore data'
             def jsonData =  "{'book-store:books':{'lang':'English/French','price':100,'title':'Matilda'}}"