Yeah. I'm a big fan of making the person who made the promise fix the mess. You dreamed up something and promised it to the customer? You get to go back to the customer and eat the crow. Maybe that will teach you not to do it next time.

Anything else is just enabling (or even rewarding) bad behavior. If you do, expect to get more of it.

Note well: I have never been a manager, especially not an upper-level manager over both sales and engineering. I don't know how well my recommendation will fly in the real world. (Hey, I guess that makes me the guy who just sold something without knowing if it can work...)