F1 2011 Failure question (Database editor)

[CitroenC5]

Did somebody know , where i can edit the failure rate of the drivers/teams in the database editor? I thought i can change them in canned_events_driver_modifiers but every change i made is without a result ( i play races over 20% distance and every car finished).I tried e.g -99 or 99 in engine failure but nothing happens.

 

[CitroenC5]

Has nobody the answer?