Difference from previous date aggregate on graph

[Anonymous]

Hello world, 
I have made this calculation to obtain some specific data

Unapp = 
CALCULATE(COUNT('Dim - Sales'[AR Id]),filter('Fact - Receipts','Fact - Receipts'[AR Status]=="UNAPP"))

and I create this graph
 

What  i want to get is the difference from previous time aggregation, depending on that the user chose form the drill down 
E.G on the current graph it would show for 2019->7k and 2020->-28k , but once the user opens it for month view it would show e.g data for February 2020-data for January 2020
In tableau this is done with difference from previous, over here how can I do it?
Thanks everyone!!

[v-eachen-msft]

Hi @Anonymous ,

You could add two fields in x-axis: Year and your date column. Then use ISINSCOPE() function to show the result.

[Sum] is the result of every month, [Measure] is the difference from previous year.

Measure =
VAR a =
    CALCULATE (
        SUM ( 'Table'[Value] ),
        FILTER ( ALLSELECTED ( 'Table' ), 'Table'[YEAR] = MAX ( 'Table'[YEAR] ) - 1 )
    )
RETURN
    IF ( ISINSCOPE ( 'Table'[Date] ), [SUM], [SUM] - a )

Here is my test file for your reference.

[amitchandak]

@Anonymous , you have to create diff between each period and merge then into one measure

using

refer : https://www.kasperonbi.com/use-isinscope-to-get-the-right-hierarchy-level-in-dax/

Or refer last period Employee in https://community.powerbi.com/t5/Community-Blog/HR-Analytics-Active-Employee-Hire-and-Termination-trend/ba-p/882970

[Anonymous]

To be honest I don't really get how this isinscope would function with the graph/my data.