Thanks for the link, Drialik!
@Shatterhand , please post your support of the idea in the thread Drialik referred to. Currently, the idea of a confirmation button in the wholesaler is forwarded. If you'd like to see a confirmation button for other trades as well, you could mention that in the thread. I'll close this thread as a duplicate.
Edit: Sorry, I now see that you've already done that, Thanks!