Summary This article entails how to cancel an invoice. Applies To MachPanel all versions Solution To cancel an invoice please follow the steps mentioned below: 1. Navigate to Home>>Billing Manager>>Documents>>Invoices 2. Click on the specific invoice you want to cancel. 3. Then click on the cancel invoice button. 4. A window appears with following options: Issue Credit Effect on Service(s). Comments field Complete the options as indicated below and then click on submit button. Note: Write any descriptive text in the comments field.