Creating aggregates

Hi
we have few aggregates on one of our cube. i am trying to create new one. the idea is we have to create exactly similary aggregates but replace few of our existing attributes with navigational attributes.
i have an aggregate which includes
Material no, Material type
Location type
fiscal year
this aggregate is in production for some time.
now when i created exactly similar aggregate with the same fields and rolled up data. the number of records written are same but the summarization ratio is 1. since i am having material no in my aggregate i can understand that. but its exactly the same aggregate which exist in production and the summarization ratio for that is 212.
would be great help
thanks

Thanks
here are the details
Material (Dim)
      Material Divison
      Material
      Material type
Location (Dim)
      Territory
Time  (Dim)
      Fiscal year
Records writter are   2254003
Summarized ratio  212
i have to create new aggregate by replacing Material division with its navigational attribute. when i created it i only have summarization ratio as 3. so i created exactly the same aggregate without any navigational attributes once again just to see whats the summarization ratio and it also has 3.
do you require any further information.
yes its in production.

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