I am facing a problem, I need to calculate total of a specific measure regardless selections except Year and Month, that mean the total depend on the time
I used the following expression but it doesn't work
Sum({1<Year=P(Year),Month=P(Month)>} Total Amount)
Would be helpful if you tell us what exactely doesn't work, i.e. what you get and what you expect.
I assume if you select in a field connected to Year, but not in Year, you still get a filtering of the records because of the p() function, while you expect to see the total unfiltered.
Try creating an alternate state (settings - document properties - alternate states), call it e.g. AS, then use
=Sum({AS<Year=$::Year,Month=$::Month>} Total Amount)
