The Session.move(...) method is currently checking to see whether the destination parent already has a child with the same name as the node being moved. Per section 7.1.7 of the JCR 1.0.1 specification, "An ItemExistsException is thrown either immediately or on save if a property already exists at destAbsPath or a node already exists there and same-name siblings are not allowed." The method should throw this exception only if SNS are not allowed.