Project Progress(Physical Percent Complete) wont rollup to parent Task

Summary:

Our customer , is trying to upload the Project Progress via FBDI "Import Project Progress", however we have noticed if the customer is providing the Physical Percent Complete at the lowest tasks , its not rolling up to the paarent tasks , users have to manually provide the percent complete on the parent tasks as well. Can this be solved so that only lowest level of tasks requires Physical Percent Complete, parents automatically gets the rolled up Physical Percent Complete from child tasks.

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