First post, so apologies if I'm being stupid

I have a question I was hoping somebody might have the answer to - or at least could point me in the right direction

Scenario - dutching 3 horses. My concern would be that after clicking 'place bet' in the BA software, only two selections match (due to liquidity issues).
Is there anything I could do that says something like, "IF dutched selections matched, place bet, if not, scratch?"
Best,
lewcla