I hope the table may be in UseLock or DeadLock. Check whether the table is under a lock or not.
What manual says:
Quote:
-911 A SYNCPOINT command with the ROLLBACK option was issued
on behalf of your application process. All updates (CICS
commands and DL/I calls, as well as SQL statements) that
occurred during the current unit of work have been undone.
(SQLSTATE '40001')