DFS0774I (CCCCFFSS) AREA=`AREANAME` DD=`DDNAME`, AREA CLOSED, MUST COMPLETE TOSSED, CI-RBA=`NNNNNNNN`N, SEVERE ERROR

Explanation
 An attempt was made to write to a closed area. This
situation indicates a system error.

System action
 The WRITE MUST COMPLETE DMHR is disregarded,
and the dependent region is terminated.

System programmer response
 Contact IBM® service.