display null for future dates since the last sale date for MTD

Hi,

I want to show null value for future dates in MTD since the last sale date (we can assume this is the date after last non empty date).
Please look at the screenshot below.

Here is my MDX query for MTD which I got through time business intelligence function. Can someone please help me change the query to achieve above ?

CREATE MEMBER CURRENTCUBE.[Date].[Calendar Date Calculations].[Month to Date]
 AS "N/A", 
SOLVE_ORDER = 1, 
VISIBLE = 1;          //  Month to Date
  ( 
	[Date].[Calendar Date Calculations].[Month to Date],
    [Date].[Month].[Month].Members,
	[Date].[Date].Members 
  ) 
  =

  SUM(
             { [Date].[Calendar Date Calculations].[Current Date]  } 
             *
             PeriodsToDate(
                            [Date].[Calendar].[Month],
                            [Date].[Calendar].CurrentMember
             )
  );