When you define a Portfolio Budget curve within any curve family type (Project/Shell, Summary CBS, CBS, and Business Process (Commitments)), you have the option to select the currency (Currency field under Cost) of the Portfolio Budget data source, from the Portfolio Manager.
The Currency field is a required field (default value: Project Currency), if you have Portfolio Budget curves. You can change the value of the Currency field to another value by opening the curve configuration window.
Note: When you run a report, the value of Currency, in the report, is also Project Currency unless you have selected another value.
The Currency field lists all Active and future currencies from the Exchange Rates (Company Workspace > Admin mode > Standards & Libraries > Exchange Rates). The Show Currency List window lists the available currencies that you can select.