Blended different data

[cantalouuuuuuuu]

Hello, 

I have two different result with the same blended : 

As you can see i have a result with :

50.61 ( is the good answer ) -> with no dimensions in blended and the cross join 

51.17 (not the correct answer) -> with the dimension date on blended

but if i want to have a time chart serie i have to add the dimension date in the blended. 

do you know how can make to have the right result with the dimension date.