How to get the same period last year value using Fiscal Calendar?

Question

Hi there,
I am using DAX in a Tabular Model project but I am getting stuck trying to get the following:
We are using a Fiscal Calendar (from 01 April to 31 March). 
Previous Period Value
       Value
2012
April
15
May
10
Jun
20
2013
April
15
30
May
10
20
Jun
20
25
I have tried to use sameperiodlastyear but there is an error saying that this function cannot be used for non contiguous dates. DATEADD is given the same error...
Could anyone help me getting the right measure expressions for [Previous Period Value]?
Thanks and best regards,
Joss

Answer 1

Hi Joss,
In SQL Server Analysis Services, we can can compare revenue with the hierarchy periods (year, month, day) by using the PARALLELPERIOD function, and now you want to compare with custom periods. (NOTE: We cannot compare it with the PARALLELPERIOD function
since
PARALLELPERIOD function returns a member from a prior period in the same relative position as a specified member. So if the first time span not equal to the second one (such as the first period is 3 days, and the second period is 2 month)).  Here
is a sample query about PARALLELPERIOD function for your reference.
with
set Hotels as
[Hotels].[Hotel ID].&[1015],
[Hotels].[Hotel ID].&[5640],
[Hotels].[Hotel ID].&[8800]
set Period as [Arrival Date].[Date].[Month].&[2012]&[1]:[Arrival Date].[Date].[Month].&[2012]&[12]
member [Arrival Date].[Date].[0] as sum({ Period })
member [Total Amount N-1] as (PARALLELPERIOD([Arrival Date].[Date].[Year], 1, [Arrival Date].[Date].[Year].&[2012]), [Measures].[Total Amount])
select
[Measures].[Total Amount],
[Measures].[Total Amount N-1]
} on 0,
nonemptycrossjoin
Hotels,
Hotels.[Hotel].children,
*{[Arrival Date].[Date].[0]}
} on 1
from [Booking_Cube]
Regards,
Charlie Liao
TechNet Community Support