Custom Calculation not working and giving incorrect result

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Hi all,

My Custom Calculation is not working and giving incorrect result.

My formula will work if I will use in this syntax-

 [Allocation Per Day]:=(([Drilling Allocated Amount],[Rule])+([No Driver],[Rule]))/365;

But in case of "365" if I will store this 365 in other Driver dimension i.e. "Rig1 Operating Days" instead of using 365 and change the formula accordingly then it will not work-

 [Allocation Per Day]:=(([Drilling Allocated Amount],[Rule])+([No Driver],[Rule]))/([Rig1 Operating Days],[Rule]);

Instead of "365", I am taking "([Rig1 Operating Days],[Rule])" but it is not working.

Can anyone help me out with this?