Clarification for Retro Costing Process Start and End Date parameters

Summary:

I need some clarification on how the “process start date” and “process end date” parameters function for the calculate retro costing flow pattern.

I have been told two different things. I have been told these parameters look for actions that would trigger retro in the time period specified. I have also been told that their purpose was to prevent retro transactions calculating past the start and end dates.

Can someone clarify the purpose of the “process start date” and “process end date” parameters?

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