Bridge Table check box in OBIEE 10G

Hi,
In BMM layer of OBIEE 10G, we see a Bridge Table check box when we double click on each table.
What is the difference it makes if we check that VS don't check that. Is it mandatory to check it?
There are 2 ways to model many-to-many relationships.
1. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact and Dimension tables. Do an inner join between Bridge-->Dimension and join the Dimension to the Fact.
Question:- In this case do we need to check the Bridge Table check box on the Dimension table?
2. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact, Bridge and Dimension tables. Fact-->Bridge and Bridge-->Dimension.
Question:- In this case do we need to check the Bridge Table check box on the Bridge table?
Thanks,
Anilesh

Hi,
My question is -->What is the difference it makes if we check that VS don't check that. Is it mandatory to check it?
And we are following the first approach out of the 2 approaches listed below.
There are 2 ways to model many-to-many relationships.
1. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact and Dimension tables. Do an inner join between Bridge-->Dimension and join the Dimension to the Fact.
Question:- In this case do we need to check the Bridge Table check box on the Dimension table?
2. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact, Bridge and Dimension tables. Fact-->Bridge and Bridge-->Dimension.
Question:- In this case do we need to check the Bridge Table check box on the Bridge table?
Thanks,
Anilesh

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