If you manually issued a payment credit and it no longer applies, you can void it. This keeps a record of the credit but removes it from the student’s current balance. If the credit came from a guardian’s online payment, it cannot be voided and you can refund it instead.
Steps to void a credit:
Log in on the web
Select Billing from the sidebar > Students tab > Click the student's name
Jump to the Available credits & payments tab
Next to the credit, click Actions > Void