Error Message :
If an ATTACH_SYNC script statement is used to assign a Sync object to tasks in a Workflow, the option SYNC_CHECK_RESTART = Y is ignored when the job is restarted. The Option SYNC_CHECK_RESTART has no affect on syncs attached with the script function ATTACH_SYNC.
According to documenation for the SYNC_CHECK_RESTART option it:
Determines whether Sync objects are checked when restarting a canceled job without an Abend action.
Allowed values: Y and N
Y - Sync object is checked when restarting a canceled job without an Abend action.
N - Sync object is not checked, a job is restarted immediately.
Default value: Y