Why does my bets get "cancelled"?

[yrufset]

Hello
i set up an excel trigger that suppose to back a horse when a few conditions are met.
but instead of the bet being matched it's getting "cancelled" every time...

can someone explain why?

thanks.

[GaryRussell]

You mean the bets does get placed and then gets cancelled? Are you sure it's not a case of the bet being placed and then Betfair lapsing it because it never got matched. If the bets are getting placed then this is not a fault in BA, it has done it's job. There is no guarantee the bets will get matched.

[yrufset]

I never thought it was BA's fault.
i guess that your explanation feats....