There a couple of different ways to edit an invoice from the contact profile that will allow you to make adjustments to the invoice.
Note: It is not recommended to edit an invoice to apply a payment; instead post a payment to the account which allows for more accurate recordkeeping (E.g. Posting a payment will show the date that the invoice was actually paid instead of the date the invoice was created).
- Open the contact profile and select the Account & Invoice tab.
- Under the Invoice section, select the invoice and either double-click, right-click and choose Edit, or click .