Exposing Income and Expense Totals in a Customization

I’m working on a customization for the project screen to expose two amounts from the Balances screen (1) Income Totals - Actual + Open Committed Amount and (2) Expense Totals - Actual + Open Committed amount. 

I can’t seem to figure out how to reference this part of the schema as the data field for my custom field.

I’ve tried various iterations the last of which looked like….

                          Balances.Income.CuryActualPlusOpenCommittedAmount    and

                          Balances.expense.CuryActualPlusOpenCommittedAmount

Those did not work. Any thoughts would be appreciated.