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I am unable to answer your main question. But do you have the Data lineage spreadsheet handy ? That would give you the lowdown on the source for a specific metric etc..
Try the metalink note - Oracle Business Intelligence Applications ETL Data Lineage Guide Release 188.8.131.52 and 184.108.40.206 [ID 1274680.1]
Thank you - I have, yes.
It looks like w_wrkfc_bal_a holds this in the headcount attribute, but in the data lineage spreadsheet, the detail in the SQL Overrides tab is truncated (this seems to be a common issue with this spreadsheet) - I'm using Excel 2007 and have tried downloading the XLS again. So, I cannot see the code use. As I mentioned, I don't have access to an Informatica environment unfortunately as we don't have any environments in place yet.
The only precise way to figure out how the measure is derived is to work with a BI Apps developer to track the measure back through the product stack e.g. OBIEE metadata (RPD) -> DataWarehouse Admin Console (DAC) -> Informatica mappings -> source tables/columns. The ETL, by it's very nature, may manipulate a base measure from the source system (EBS, PeopleSoft etc) in unusual ways. Once you have performed this data lineage, I recommend updating the tool tips (column descriptions) in the RPD to make the product more intuitive for end users.
So, to answer your question, there is nowhere specifically where this information is described in such detail.
You may wish to look at the BI Applications metrics reference and the business analytics warehouse data model reference documents in MOS:-
Oracle Business Intelligence Applications Metrics Reference Guide Release 7.9.6,220.127.116.11 [ID 846917.1] -- I do not believe there will be a later version available until 18.104.22.168 is released
Oracle Business Analytics Warehouse Data Model Reference Version 22.214.171.124 [ID 1325948.1]
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The answer is NO..having 2 job roles will not equal 2 people in your headcount. The ETL process will ensure that each employee is counted once in the target fact table (W_WRKFC_EVT_MONTH_F). Note that you will have Employee and Contingent workers as separate calculations.
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