* @throws ItemStateException
*/
public NodeState createTransientNodeState(NodeState overlayedState, int initialStatus)
throws ItemStateException {
ItemId id = overlayedState.getNodeId();
// check map; synchronized to ensure an entry is not created twice.
synchronized (transientStore) {
if (transientStore.contains(id)) {
String msg = "there's already a node state instance with id " + id;