Why can't I add budget data for the following years in the data entry screen

Castaway is a comprehensive modelling tool that allows you to create a 3-way rolling forecast for a maximum period of 15 years. 

To forecast for subsequent years in the Forecast workspace, you will need to navigate to the element data entry screen of the specific account and double-click on the annual column header to expand your view to the individual months. 

By default, Castaway only displays the current financial year but by expanding your view, that view will remain consistent across your file as you extend your forecast. 

Likewise, you can also collapse/hide the periods within a financial year by double-clicking on the annual column.