OBIEE - How to get count of members for a level?

I have a dimension logical table and hierarchy defined in my BMM layer. I want to define a logical column that can get distinct count of members at Level0.
Level2
Level1
Level0
I tried creating a logical column using Level0 key and Count Distinct aggregation function in my dimension table. But when I use this column in the report, it gives navigation space error.
Any ideas/thoughts on how to achieve this?
Thanks in advance

Aggregations always work on columns in a logical fact table and never on a logical dimension
- Create a logical fact table based on the same physical table
- Create a logical join between the newly created fact table and the dimension table whose levels we want to count
- Create the Count Distinct columns, one each based on the level key columns
- Expose the columns to the presentation
- Deploy the rpd and it works like a charm
Edited by: Mahesh Jayashankar on May 31, 2011 8:45 AM

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