Task
When defining Fixed Price Billing Items, only those tasks having a Billing Type of FP will be displayed in the task drop-down (along with their completed or revised end date). Note that the date displayed next to the task name will reflect the Task's Revised Date unless a Completed date has been populated on the task in which case the Completed Date will be displayed.
If the project's Billing Type is FP, an additional <No Task> option will be available in the task drop-down to facilitate fixed price items at the project level.