obia domain member mapping process

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HI All,

I have following doubts in obia:

1. How to find out domain member mapping task to corresponding ODI mapping

          Ex: Task: Manage Domains and Member Mappings for Business Location Dimension, Country and State Prov are two domain member.  I need to idenitfy which odi mapping is doing this task load and how?

2. what happen if i didn't map source domain member to warehouse domain member?

3.Give best example for domain mapping for source to target and how these values going to  odi mapping and which tables are effecting

Thanks in Advance...