How to empty affiliate account balance.

Dear E-commerce masters:
No body answer my question on Opencart 2.0, so please allow me to post here at 3.0

Question: How to empty affiliate account balance.
I have paid the balance to affiliate owner, and would like to empty the balance so that I won't double pay him/her later.
Please advise how to delete all of the transaction or at least make the balance to 0. See below markup.
Thank you!

Surely that should be done in the Payments tab.

This is done by adding a transaction with the amount equal to what you paid, but negative.

Example : after you just sent your affiliate $10 in PayPal, you go to the page from your screenshot, which is Edit Affiliate (or Edit Customer in openCart 3) - Transaction tab, and Add a Transaction with "-10" amount.