Where is OBIEE stands in the development environment? | OBIEE

OLTP(Transactional Database) —-> OLAP (Data warehouse environment)—-> OBIEE(report generation tool).
(or)
OLTP(Transactional database)—–> OBIEE (reporting tool)
i.e Obiee tool can extract data directly from transactional database or data warehouse environment to build reports. It all depends upon the environment setup at clients place.