We've recieved a lot of requests about key deposit.
How to add the Key deposit.
You can add the Key Deposit by creating such fee.
After that activate this fee in the reservation sources. Once they're configured there, the deposit will be added automatically to the reservation. If it's not configured here, you'll need to add this fee to the reservation manually.
Once you need to give this "Key Deposit" back, you need to do the adjustment for this fee first.
Once it is done, the balance become -300.
You have already adjusted the "Key Deposit", after you need to refund the money.
So you need to use the "Refund" option.
The balance due will become 0.