12 month sum vs time filter

Hi,

I know that this topis was discussed many time but I am struggling with this problem.

I use data from ContosoRetailDW base as a demo, I would like to built measue calculatin sum of last 12 months ( currrent inculded )

I would also to present this data in 12 month range visuals beteween max date ( set manually ) - 12 months. 

I have created a measure like this, with ALL function to be able to see proper SUM while using Date filter. 

Last 12M sales amount = CALCULATE([Sales amount],ALL(DimDate[Datekey]),DATESINPERIOD(DimDate[Datekey].[Date],LASTDATE(DimDate[Datekey].[Date]),-1,YEAR))

 

But I have two problems:

 

First when I filter by TimeYear = 2009 I got also calculation 2010 

Second for January 2009 I would like to get SUM of 2008 too. 

 

 

Is the any possibility to publish pbx file here ?