The Scheduled Expense Allocation selection criteria allows you to specify whether you would like to:
Include Entire Scheduled Expense -- When selecting this option, the planned / budgeted amounts reflected in the report output will not be prorated to the specified date range. They will instead be the entire scheduled amounts.
Include Portion of Scheduled Expense within Schedule Period Only -- When selecting this option, the planned / budgeted amount included will be a prorated amount that reflects that portion of the scheduled amount for that particular span of time. In order to calculate this prorated portion of the scheduled amount, the entries must have begin and end dates supplied. For example, a project that has a 12 month date range with a $1200 scheduled amount -- would display a $100 amount if the report were run for a one month period.