I have made a new reservation and have gotten 10 USD discount and paid 15 USD as deposit . Please see:

But when I made a payment for deposit or discount, the both value of Discount and deposit were lost . Please see:

Remarks
If I made any payment, the both value of discount and deposit will lose. So I cannot know if there are disnount or deposit for this reservation before.
Is it possiable to keep another value if I pay any one until all discount and deposit are paid to account?
Thanks
Gustav