IS Summary

Hi All,

I just wanted to understand the importance of Is summary in Anaplan. I have a module created with Is Summary switched on for a line item in my module which is preventing that line item from coming in the export view taken out by omitting summary items. When I remove the checkbox from is summary for that line item I see no impact on my values. Can anyone please help me understand the possible reason that why it would have been marked with Is summary on?

Thanks in advance.