This operation must be called asynchronously. This operation may be called either synchronously or asynchronously. This operation must be called asynchronously. This operation may be called either synchronously or asynchronously. A document/literal binding of this portType should be implemented by clients that elect to recieve asynchronous notification of PO status changes. The SOAP version of that binding should correspond to the version of SOAP used for the initial CreatPO operation. Note this binding is intended to be used to implement the client-side notification endpoint.