If this error condition occurred, the task gets abnormally terminated.

CommandRESP2, Description & Solution
LINK 29 - The SYNCONRETURN option is specified and the server program cannot successfully take a sync point.
Solution - In this case, the client program is in an incorrect state to support the SYNCONRETURN option. Modify the program to remove it.
SYNCPOINT Occurs when a SYNCPOINT command is ambitious into rollback by a remote system that is unable to commit the syncpoint.
Solution - Analise why the SYNCPOINT ROLLBACK issued.