The completion of IXLCACHE REQUEST=UNLOCK_CASTOUT request can be affected for the following reasons:

• The request exceeds the time-out criteria for the coupling facility. (Time-out criteria is model-dependent.)
• A name element specified a data item that is not defined to the cache structure.
• The connection specified on the CONTOKEN keyword, or the process or task specified on the PROCESSID keyword, does not hold the cast-out lock for one of the data items specified by the name element.
• A name element specified a data item with parity bits that are not valid.
• A name element specified a data item that holds a cast-out lock in a write-with-cast-out state. The write-with-cast-out lock state is not compatible with the change indicator for the data item.

Each time a request completes prematurely, the system returns an index value into the list of name elements in the CAAULINDEX field of the answer area. Use this index value in CAAULINDEX to:

• Locate the name element that specified the undefined data item, the data item with a connector, task, or process that does not hold the cast-out lock, the data item that specified parity bits that are not valid, or the data item that requested an incompatible update for the change indicator.
• For time-out problems, restart the request so it can process the remaining elements in the list of name elements.