diff --git a/source/java/org/alfresco/opencmis/mapping/IsPrivateWorkingCopy.java b/source/java/org/alfresco/opencmis/mapping/IsPrivateWorkingCopy.java
new file mode 100644
index 0000000000..fbfe39b1f5
--- /dev/null
+++ b/source/java/org/alfresco/opencmis/mapping/IsPrivateWorkingCopy.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2005-2014 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.opencmis.mapping;
+
+import java.io.Serializable;
+
+import org.alfresco.opencmis.CMISConnector;
+import org.alfresco.opencmis.dictionary.CMISNodeInfo;
+import org.alfresco.service.ServiceRegistry;
+import org.apache.chemistry.opencmis.commons.PropertyIds;
+
+/**
+ * 'cmis:isPrivateWokringCopy' property accessor for CMIS 1.1 (<a href="https://issues.alfresco.com/jira/browse/MNT-11631">MNT-11631</a>)
+ * 
+ * @author Dmitry Velichkevich
+ */
+public class IsPrivateWorkingCopy extends AbstractProperty
+{
+    protected IsPrivateWorkingCopy(ServiceRegistry serviceRegistry, CMISConnector connector)
+    {
+        super(serviceRegistry, connector, PropertyIds.IS_PRIVATE_WORKING_COPY);
+    }
+
+    @Override
+    protected Serializable getValueInternal(CMISNodeInfo nodeInfo)
+    {
+        if ((null == nodeInfo) || !nodeInfo.isDocument())
+        {
+            return null;
+        }
+
+        return connector.getCheckOutCheckInService().isWorkingCopy(nodeInfo.getNodeRef());
+    }
+}
diff --git a/source/java/org/alfresco/opencmis/mapping/RuntimePropertyAccessorMapping.java b/source/java/org/alfresco/opencmis/mapping/RuntimePropertyAccessorMapping.java
index a7777893be..41b1bcab89 100644
--- a/source/java/org/alfresco/opencmis/mapping/RuntimePropertyAccessorMapping.java
+++ b/source/java/org/alfresco/opencmis/mapping/RuntimePropertyAccessorMapping.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2010 Alfresco Software Limited.
+ * Copyright (C) 2005-2014 Alfresco Software Limited.
  *
  * This file is part of Alfresco
  *
@@ -145,6 +145,9 @@ public class RuntimePropertyAccessorMapping implements PropertyAccessorMapping,
         {
             registerPropertyAccessor(new DescriptionProperty(serviceRegistry, cmisConnector));
             registerPropertyAccessor(new SecondaryTypesProperty(serviceRegistry, cmisConnector, cmisMapping));
+
+            // MNT-11631: 'cmis:isPrivateWorkingCopy' property accessor
+            registerPropertyAccessor(new IsPrivateWorkingCopy(serviceRegistry, cmisConnector));
         }
 
         //