You can understand how to book expenses in PSOhub, from the article Expenses.
In the example below, we have expenses booked against three expense contract lines. The Amount and Used columns displays the value of the expenses in the project currency:
In the Expenses section of the right-hand pane, click Show all related expenses. The Expenses page appears with a summary of all expenses logged against the project. The Amount field is displayed in the currency of the project:
To display the value of the expenses in the organization's base currency, in the Expense summary, click the Back button to return to the project. In the CONTRACT tab, click the More button and select Show in company currency:
The Contract's values are now displayed in the organization's base currency, which in this example is Canadian Dollars:
To return to the project's currency. click More and select Show in project currency: