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I received a hint on OBIEE time series functions from my friend Peter S. Apparently the time series functions AGO and TO_DATE don’t work when you’re using it on tables with fragmented LTS.

A quick test yielded this:

State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 22042] AGO function may not be used on ‘Amount’ because its source is horizontally partitioned. (HY000)

Checking metalink, I found document 739584.1 – AGO function with combined multiple sources. Enhancement request #7438154 has been raised and is targeted for 11g.

Cheers all!