LAST DATE

Oros usually for time intelligence you should use a calendar table, and you can easily create one from my blog post here Create a basic Date table in your data model for Time Intelligence calculations | PeryTUS IT Solutions

but you can change your measure like this and try

RollingSum =

   VAR NumDays = Parameter[Parameter Value]

   VAR RollingSum =

        

         CALCULATE(

        

         SUM('SALES_TABLE'[Invoiced QTY]),

        

         DATESINPERIOD('SALES_TABLE'[Postingdate], TODAY(),-Parameter[Parameter Value],DAY)

         )

        

         RETURN

         RollingSum

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