Why not? It isn't supported? I just checked In Transaction in trigger is a 
preemptive compliant. It means, preemptive mode does expect transaction. Any 
hidden constraint?

Without transaction, trigger is meaningless. When a trigger invoked, mulitple 
tables might be updated inside the trigger. When trigger was rejected, other 
updated tables won't roll back except the trigger invoking table. This would 
cause serious
data integrity issue.

Alan Chan

4D iNug Technical <4d_tech@lists.4d.com> writes:
>transactional data entry is kind of task you would typically want to avoid 
>using preemptive mode.

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