Help with Horse racing trigger

I am currently using a trigger for Laying favourites in Horse Racing using the Fibonacci staking plan.

The trigger mainly behaves as it should. However, the main problem is that sometimes when the race times are close together or a race is delayed the trigger matches a second bet before the first bet is settled.

The problem with this is that in these cases the staking plan does not work and causes multiple ripple effects.

Can anyone please tell what condition I can put in place that will prevent the trigger from placing a bet until the previous matched bet has been settled.

The trigger can continue to run, but only place a bet if the previous matched bet has been settled.

Please let me know if you need further clarification.

Thank you for your help.

Hi
Have a look at Item 3 here. That should sort it.

Hi,

I will see if I can figure it out. 

Will let you know how I go with it.

Thank you very much.