If you choose to refuse a deal, you actually state that the deal has not gone through for a specific reason.
- You can edit those reasons under Settings > Preferences > Manage deal loss reasons.
- Refused deals are also taken into account in the statistics.
Deleting a deal is irrevocable.
- You cannot retrieve it.
- It is not taken into account in the statistics.
Note: It's better to only delete a deal if you're sure that there has been a mistake.