Index: oak-core/src/main/java/org/apache/jackrabbit/oak/security/authorization/accesscontrol/AccessControlValidator.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/security/authorization/accesscontrol/AccessControlValidator.java	(revision 1703620)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/security/authorization/accesscontrol/AccessControlValidator.java	(working copy)
@@ -209,7 +209,8 @@
         }
 
         if (!requiredMixin.apply(accessControlledTree.getNodeState())) {
-            String msg = "Isolated policy node. Parent is not of type " + requiredMixin;
+            String path = accessControlledTree.getPath();
+            String msg = "Isolated policy node " + path + ". Parent is not of type " + requiredMixin;
             throw accessViolation(6, msg);
         }
     }