Physical / Business / Presentation Layers

I appreciate that OBIEE is primarily a datawarehouse tool and that best results are achieved by creating star structures as the basis for building reports, BUT, say you have a highly volatile area, where people are really on interested in the situation 'now' as they are looking for items that have not be fulfilled; -
1. Can you model the layers directly from the transacting database
2. What struture should you use, given that the tables follow this physical model?
Header < Line < Distribution
|
Header< Line < Distribution
n.b. < = 1 to many - there is no crows foot on my keyboard
| = optional 1 to 1
The reason for my question is star format consistently works for me, but if I try anything else the Administrator tool will not let me save the result.
Thnaks for any input,
Robert.

Robert,
Regardless of complexity (3nf transactional) or simplicity (think flatfile) we must always model a star schema in the BMM. For your example I'd consider one 'invoice' logical fact with 3 logical table sources, one for headers, one for lines, one for distributions (each mapped to equiverlant physical table). I'd be looking to map as much as possible against all 3 logical table sources (like Value, Qty etc. etc.).
Then look to de-normalise as much as possible into an 'Invoice Dim' of sorts and have levels 'Header' - > Line -> Distribution as the hierarchy so we can set the content levels in our LTS's accordingly back on our logical fact.

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