In certain cases, employees are granted allowance for short (less than 24hrs) travels overnight (without accommodation). This dialog is used to define if such allowance should be calculated in the Expense Sheet. The dialog becomes available when you save an expense sheet covering a travel time period of less than 24hrs, and also if you use Create Allowance, Create Summarized Allowance right mouse buttons. Mark the check box implying that you want to trigger the calculation and select OK to calculate allowance.