Duplicate attribute key found when creating a dimension

Question

Good Afternoon,
I created a cube with dimesnions and all is working fine. I created three dimension ZONE,BLOCK and STREET and these are reltated to the FACT table and all is well. But i was thinking since these 3 dimensions are related and coming from the same table, why
not just create one dimension with ZONE as the primary key and the heirarchy as zone>block>streetname. In the DSV i created a named query.
SELECT DISTINCT ZONE, BLOCK, STREET
FROM dbo.MYTABLE
group by zone,block,street
order by zone,block,street
Please see the sample dataset as well, where when i process the DIMENSION fails with an error that the "Duplicate attribute key was found, column name:Zone, value:1). I know zone and also the other two columns when processed are repeated more than once
and hence this, is there a way to get what i want.
ZONE BLOCK STREET
1 0 Chesapeake
1 0 East Market
1 0 East Maryland
1 0 East Washington
1 0 North Capital
1 0 North Delaware
1 0 North Illinois
1 0 North Meridian
1 0 North Penn
1 0 South Delaware
1 0 South Illinois
1 0 South Meridian
1 0 South Penn
1 0 Virginia
1 0 West Georgia
1 0 West Jackson
1 0 West Market
1 0 West Maryland
1 0 West New York
1 0 West Washington
1 100 East Washington
1 100 East Market
1 100 East Maryland
1 100 East New York
1 100 East Ohio
1 100 East Washington
1 100 North Alabama
1 100 North Capitol
Thanks
SV

Answer 1

Thanks Richard and SS. This is what i did.
1) In the DSV i created a new named query, the same one i used.
2) Set Primary Key on Street.
3) Created a dimension STG_ZBS_DIM and while creating the heirarchy , i draged and dropped the fileds in the following order (zone>block>street).
4) Tired to process , but getting the same error, except this time at the street level.
What else i did was changed the primary key back to Zone, went into the attribute relations and set the relation from Zone to Block and then Block to Street, saved and processed and this time i got the error at the block level :-(
Thanks
SV