OK thank's for you reply.
Infact my first trigger is without minute before the off, but in this case the trigger make immediate bet, like you notice "Going Behind executes At The Post".
No problem for this i can wait a fix, i can't fire the bet at the post because i need to place bet only 30-60 second before the effective start of the race.
For now i had removed the option of race status and set minute before the off 0.3
The last option is to fire a lay bet in play, maybe using SP like indicator.