You must code STGCLASS to assign the data item to a storage class, and ELEMNUM to specify the number of data elements that are to be allocated to the data item.

Data that you write to the data item must be in the local cache buffer. You identify the buffer by coding either BUFLIST or BUFFER and related keywords. Data that you write to the adjunct area must be in a storage area identified on the ADJAREA keyword, and the cache structure must be allocated with adjunct areas when you connect to the structure.

When the WRITE_DATA request completes, the system provides a return code, a reason code, and appropriate answer area information. Examine the information that the system returns, and take the action that is appropriate for your program.