Anaplan model builder level 1 exam activity 2

Hi, I am trying to update REV02 volume inputs from DATA02 SKU volume module using a formula. 

when I type the formula ‘DATA02 SKU Volumes’.Volume , it returns the error message that: invalid formula for REV02 Volume inputs’. Volume. Automatic sum of DATA02 SKU volumes’.volume over P3 SKU hierarchy is not possible as P3 SKU does not have a built in top level.

 

what does this mean and how should I correct it?

 

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