wrong values after designing Universe in IDT

Hi All,

I have three tables in a Universe

Table1 (prod_dt , grade,daily_value, monthly_vaal);
Daily each grade will have only one row like
01/01/2013, A,1234,1234
01/01/2013, B,234,234
01/01/2013, C,1111,1111
01/01/2013, D,134,134

Table2(frm_dt,to_dt,plant,grade,plan_value );
      Table1 prod_dt falls between frm_dt and to_dt  - there will be only only one record for each plant,grade code for this.
      Table2 can have multiple plant with same type of grade.
01/01/2013,12/31/2013,P1,A,666
01/01/2013,12/31/2013,P2,A,755
01/01/2013,12/31/2013,P3,A,665
01/01/2013,12/31/2013,P4,B,669
01/01/2013,12/31/2013,P5,B,363
01/01/2013,12/31/2013,P6,B,989
01/01/2013,12/31/2013,P7,C,666
01/01/2013,12/31/2013,P8,D,777

table3(date_val, grade,plant,suppose_val);
This is a derived table which will get one record for each date,plant.grade

01/01/2013,12/31/2013,P1,A,111
01/01/2013,12/31/2013,P2,A,222
01/01/2013,12/31/2013,P3,A,333
01/01/2013,12/31/2013,P4,B,444
01/01/2013,12/31/2013,P5,B,555
01/01/2013,12/31/2013,P6,B,666
01/01/2013,12/31/2013,P7,C,777
01/01/2013,12/31/2013,P8,D,888

Now my Question is when I am joining this tables together
Table1-table2 on(date,grade)
Table1-table3 on (date,grade)

and trying to query the records like
Table1.grade,table1.daily_value,table2.plan_value ,table3.suppose_val

in WEBi i am getting proper results like

A,1234,325,365
B,1234,325,365
C,1234,325,365
D,1234,325,365

but in Dashboards and IDT query i not getting proper results like

A,1234,325,365
B,1234,
C,1234,325,365
D,1234,null,null
B,null,325,365
D,null,325,365

Is there any idea what I am doing it wrong here. Any solution.