Break and Row syntax in Percentage function

Hi All,

I want to know how Break and Row syntax work in Percentage function.  As shown in the attached image, I'm able to get results ONLY using Percentage function, and hence NO NEED to add the syntax Break or Row to the formula.  Can someone please explain how Break and Row syntax work in Percentage function?

Basically, in the attached image =Percentage ([Actual Sales $]) can be used instead of =Percentage ([Actual Sales $]);Break) function.  Likewise, =Percentage ([Actual Sales $]) can be used instead of =Percentage ([Actual Sales $]);Row) in the cross table.  So why there's a syntax for Break and Row in the Percentage function?

Thanks,

Suranjith Fernando