diff --git a/amps/ags/rm-community/rm-community-repo/source/java/org/alfresco/module/org_alfresco_module_rm/fileplan/FilePlanServiceImpl.java b/amps/ags/rm-community/rm-community-repo/source/java/org/alfresco/module/org_alfresco_module_rm/fileplan/FilePlanServiceImpl.java
index 85fdeb0ca9..b7c37a434a 100644
--- a/amps/ags/rm-community/rm-community-repo/source/java/org/alfresco/module/org_alfresco_module_rm/fileplan/FilePlanServiceImpl.java
+++ b/amps/ags/rm-community/rm-community-repo/source/java/org/alfresco/module/org_alfresco_module_rm/fileplan/FilePlanServiceImpl.java
@@ -219,7 +219,7 @@ public class FilePlanServiceImpl extends ServiceBaseImpl
         }
         else
         {
-            return rmContainerCacheManager.get(storeRef);
+            return new HashSet<>(rmContainerCacheManager.get(storeRef));
         }
 
         return results;