When a change is made to an Invoice, a log of the changes and who made them is recorded on the Invoice in the History section. Below is an example of the History on an Invoice:
Each record in the History displays the Status the Invoice was changed to, the Date and Time it was changed, the user that made the change and any Notes regarding the change. If there is a Note on a History item then it can be viewed by clicking the item in the list and selecting the "View Note" button to display the Note in a popup window.