Triggers

[Stoedtler, Mathias]

Hello,
 
As I got to know "before" triggers are not allowed in MaxDB. What
happens if I create an "after" trigger for a table and raise an STOP in
it? For example after an Update, if there's a wrong value somewhere. Is
the update statement that triggers the execution of my trigger rolled
back? Can I somehow avoid that this update is done in the trigger?
 
Hope somebody can help me.
 
Regards and thanx,
  Mathias