You can transfer an existing payment from one customer to a different customer. This helps in situations where a payment was entered for the wrong customer by mistake or if a payment was entered for a master customer and later needs to be transferred to a child customer.
On the payment details page, there is a Transfer button:
Click this button to choose another customer to transfer the payment:
Note: Only payments with $0.00 applied amount can be transferred. If there is an applied amount, un-apply it before transferring.