How to re-calculate YearTotal based on requirement when it is dynamic member

Hello everyone,

I am trying to calculate the % of net sales for my GL accounts.

All my GL accounts are setting Account Type is Expense/Revenue and Time Balance is flow:

When I calculated by month, it showed correctly.

But when I see data at year total, it is a rollup of 12 months.

My member "Whatif calculation 03" is from Plan Element dimension.

My question is:

Is there any way to recalculate YearTotal as the average of 12 months in this case?

It should show 100%, not 1200%.

Thanks and have a nice day!