The game could ask you to confirm your purchase when you buy something with bonds (or something very expensive with credits).
I was planning a trip from Kobenhavn to Daedalus and I finally purchased the cheapest public shuttle ticket after waiting for a long time for the two stations to get close. Alas! 'Twas but a few moments later when I misclicked on the quantum teleportation option! Woe! Woe is me! (Okay, it's not actually that big of a deal, but still... Can't help but feel a bit regretful about it.)