Cross join issue MDX

Hi Friends,

I have an issue Zero should cross join with only Unknown  should not cross join with other times.

WITH SET [DUMMY] AS 
  {
    Filter ( [Dim_Property].[LLPG_UPRN].[All].Children,
    [Measures].[TaskStatusSecondsDuration] ),
    [Dim_Property].[LLPG_UPRN].[All].FirstChild
  }
 SET [DUMMYTIME] AS 
   {
    Filter (  [Dim_Time].[Time24].[All].Children,
    [Measures].[TaskStatusSecondsDuration] ),
    [Dim_Time].[Time24].[All].LASTCHILD
  }
SELECT    {[Measures].[TaskStatusSecondsDuration]} ON COLUMNS, 

 (
[DUMMYTIME]
*
[DUMMY]
)
   DIMENSION PROPERTIES 
   MEMBER_CAPTION
  ,MEMBER_UNIQUE_NAME
   ON ROWS
   
 FROM 
  (
	SELECT
		StrToMember(
	'[TaskStatusDate].[YYYYMMDD].&[2013-01-09T00:00:00]'
			,CONSTRAINED)
	ON COLUMNS

FROM (SELECT STRTOSET('[Dim_Operative].[Name].&[GREG HOUSE]',CONSTRAINED  ) ON COLUMNS
FROM ( SELECT - {[Dim_WorkProgramme].[WorkProgrammeType].&[Old Contract Programme Type]} ON COLUMNS
FROM [Cube] 
)))

at the moment I was getting like this.

Can anyone guide me how to solve this?

Thanks for your help