Parent-Child hierarchy without facts in top-level

Hello folks,
I've got a fact table which looks like:
fact_id | costs | some_id
1 | 5 | 1
2 | 10 | 1
and a hierarchy which looks like:
id | super_id | some_id
1 | null | null
2 | 1 | 1
3 | 1 | 1
In the business logic layer I defined two keys for the dimension talbe (id and some_id) and built the hierarchy on the first (id).
Also I defined a foreign key from the fact table to the dimension on the second.
As you see no facts are assigned to the first entry (= top-level) in the hierarchy (id = 1).
However the children of 1 have got facts.
What I want is to show the costs for the children (which is the sum of 5 and 10) and the total sum for the parent (30).
However when I drag the hierarchy and the costs into an analysis I get no results available, as there are no facts for the top-level.
How can I fix this?
Regards,
Matthias

Hi Dhar,
thanks for your reply!
What you write coincides with what I thought would happen (but didn't).
Hence there must be some error in my rpd file.
I created my hierarchy right-clicking on the dimension table and only setting the mandatory settings (that is the definition of parent/menber keys and the setup for the hierarchy table).
I didn't touch what admin-tool created inside the hierarchy, which is: a "total" level, where "grand total level" is checked, and a "detail" level, where "Supports rollup to higher level of aggregation" is checked.
What other settings in the admin-tool will I have to touch to step forward?
@anton: I'm using OBIEE 11.1.1.5.0
Regads,
Matthias

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IDOF("Retro_Biz"."Times"."Time"."Year") s_9,
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CAST(NULL AS DOUBLE) s_11
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1 s_0,
"Retro_Biz"."Channels"."MEMBER" s_1,
"Retro_Biz"."Channels"."PARENT" s_2,
SPACE(1) s_3,
SPACE(1) s_4,
SPACE(1) s_5,
SPACE(1) s_6,
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SELECT s_0, s_1, s_2, s_3, s_4, s_5, s_6, s_7, s_8, s_9, s_10, s_11, s_12 FROM (
SELECT
0 s_0,
"Retro_Biz"."Channels"."MEMBER" s_1,
"Retro_Biz"."Products"."TOTAL_PRODUCT" s_2,
"Retro_Biz"."Times"."YEAR" s_3,
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SPACE(1) s_6,
SPACE(1) s_7,
SPACE(1) s_8,
IDOF("Retro_Biz"."Products"."Product"."Total Product") s_9,
IDOF("Retro_Biz"."Times"."Time"."Year") s_10,
PARENT("Retro_Biz"."Channels"."Channel") s_11,
"Retro_Biz"."Facts"."SALES" s_12
FROM "Retro_Biz"
WHERE
ISROOT("Retro_Biz"."Channels"."Channel")
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1 s_0,
SPACE(1) s_1,
SPACE(1) s_2,
SPACE(1) s_3,
CAST(NULL AS INTEGER) s_4,
SPACE(1) s_5,
SPACE(1) s_6,
SPACE(1) s_7,
SPACE(1) s_8,
SPACE(1) s_9,
SPACE(1) s_10,
SPACE(1) s_11,
"Retro_Biz"."Facts"."SALES" s_12
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http://obiee101.blogspot.com

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=============
Dimension - logical level
===============
member key = employee_id
parent-child table source
===============
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==============
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=========
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