code: void save(TransactionChangesLog changes, TransactionableResourceManager txResourceManager)
        throws InvalidItemStateException, UnsupportedOperationException, RepositoryException
     {
        persistentManager.save(changes, txResourceManager);
     }
docs: Saves the list of changes from this storage using the given resource manager
  
  @param changes
  to commit
  @param txResourceManager
  the resource manager to use
  @throws InvalidItemStateException
  @throws UnsupportedOperationException
  if operation is not supported (it is container for level 1)
  @throws RepositoryException
  if some exception occurred