There are instances when the answer area might not be updated with valid information for a request. For example, if you issue an IXLCACHE request and the system handles the request asynchronously, the system issues a return and reason code to indicate asynchronous processing for the request. As a result, the user must assume that the data in the answer area or other storage location associated with the request is not valid. Only when the user is sure that the request has completed can the data in the answer area be considered valid. For the return and reason code descriptions of each request, see z/OS MVS Programming: Sysplex Services Reference.