What is the importance of "clear data" in data maps?

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What is the importance of "clear data" in data maps? 

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Hi Fellow PBCS users!

Our data maps utilize the "clear data" option. I think due to this "clear data", our users in SmartView will see ~10-20s of just zeros in their Excel templates, if they are pulling data during the data map. I'd like to turn off the "clear data" option, but want to understand the side effects.

As always, thank you for your answers!

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