One column in rpd is mapped to two facts (both are under same LT in BMM layer) . These two facts have joins with one dimension table.
If I select one attribute from the dimension table and the one column from the fact table , which path will obiee choose ?
OBI will choose the most economical path based on the number of joins between a fact and a dimension table used in the report.
In your example, since it has 2 fact tables in the LTS, BI server will dynamically choose any of the paths.
You can, however make the BI server to choose a defined path by setting an Implicit fact column. But, this has to be set on a subject area level. Thus BI server will choose this path for all the requests on this subject area.