Possible data loss for z/OS 1.8, 1.9 and 1.10 with fix and HSM PATCH enabled for OA22507.
Check the zSeries Red Alerts Subscription Service for more info - http://www14.software.ibm.com/webapp/set2/sas/f/redAlerts/20090824.html
http://it.toolbox.com/blogs/db2zos/red-alert-possible-data-loss-33674?rss=1