How can I create a materialized view based on hierarchical cube query?

Hi,
database version 10gR2.
When i try to create MV for sql below, i got error .
I tried creating MV log in several ways, but still, keep getting the same error.
SQL Error: ORA-12015: cannot create a fast refresh materialized view from a complex query
12015. 00000 - "cannot create a fast refresh materialized view from a complex query"
*Cause:    Neither ROWIDs and nor primary key constraints are supported for
           complex queries.
*Action:   Reissue the command with the REFRESH FORCE or REFRESH COMPLETE
           option or create a simple materialized view.So, I wonder if it is possible to create MV based on sql below?
if yes, how should I do it?
if no, what is the alternative?
select
      coalesce(UP_ORG_ID_6, UP_ORG_ID_5, UP_ORG_ID_4, UP_ORG_ID_3, UP_ORG_ID_2, UP_ORG_ID_1) as ORG_ID,
      a.day_id as day_id,
      a.TRADE_TYPE_ID as TRADE_TYPE_ID,
      a.CUST_ID,
      coalesce(UP_CODE_6, UP_CODE_5, UP_CODE_4, UP_CODE_3, UP_CODE_2, UP_CODE_1) as product_id,
      QUANTITY_UNIT,
      COST_UNIT,
      A.SOURCE_ID as SOURCE_ID,
      SUM(CONTRACT_AMOUNT) as CONTRACT_AMOUNT,
      SUM(CONTRACT_COST) as CONTRACT_COST,
      SUM(SALE_AMOUNT) as SALE_AMOUNT,
      SUM(SALE_COST) as SALE_COST,
      SUM(ACTUAL_AMOUNT) as ACTUAL_AMOUNT,
      SUM(ACTUAL_COST) as ACTUAL_COST,
      SUM(TRADE_COUNT) as TRADE_COUNT
from DM_F_LO_SALE_DAY a, DM_D_ALL_ORG_FLAT B, DM_D_ALL_PROD_FLAT D
where a.ORG_ID=B.ORG_ID
      and a.PRODUCT_ID=D.CODE
      and a.day_id=20110201
group by rollup(UP_ORG_ID_1, UP_ORG_ID_2, UP_ORG_ID_3, UP_ORG_ID_4, UP_ORG_ID_5, UP_ORG_ID_6),
      a.TRADE_TYPE_ID,
         a.day_id,
      A.CUST_ID,
      rollup(UP_CODE_1, UP_CODE_2, UP_CODE_3, UP_CODE_4, UP_CODE_5, UP_CODE_6),
      a.QUANTITY_UNIT,
      a.COST_UNIT,
      a.SOURCE_ID;Thanks in advance.

Rob vanWjik has an excellent series of fast refresh materialized views starting here:
http://rwijk.blogspot.com/2009/05/fast-refreshable-materialized-view.html
Part three specifically on aggregate MVs is here:
http://rwijk.blogspot.com/2009/06/fast-refreshable-materialized-view.html

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http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10736/advmv.htm#sthref589
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http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_7001.htm#sthref5356
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http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_8019.htm#sthref6247
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http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_6002.htm#i2106785
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How do I create a materialized view on a view ,so that it will refresh automatically on every commit in base table where the view having more that 9 function ?

Read Materialized View Refresh for complete information.
For a Jist:
Refresh Mode Description
ON COMMIT
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ON DEMAND
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