Pathway: Customer > Search > Accounts
The View Details / Adjust Invoice tool provides a way to review all charges on an invoice and reduce the amount owed or credit an invoice entirely.
...
Adjustment History and Pending Approval
Pathway: Accounting > Adjustment History and Pending Approval
Review this screen on a regular basis to accept or deny customer invoice amount reductions. Details regarding the adjusted invoice, including any notes, can be reviewed by double-clicking within the row of the account displayed. The requested amount to reduce the invoice by displays in red under the Amount column.
...