Default Expense Account in HCM Subject Areas

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The Default Expense Account is a key field for our client that is used for reporting and security management. They would like to report on it in OTBI so they can leverage Real Time reporting without having to write custom BI reports, but the field does not seem to be available in any HCM Subject Areas. Am I missing a location for it, or is it not available to be reported on? Could anyone from Oracle comment on whether this is a field that slated for inclusion in for example the Workforce Management - Worker Assignment Real Time Subject Area?