Order Entry had a separate entity: SO_LINE_SERVICE_DETAILS to store install base information associated with product sales order lines. You had to run the Service Interface concurrent program to then communicate the install base information to Oracle Service. This program is now obsolete. Order Management integrates with the various CRM products (IStore, Telesales, Quotes etc) via Order Capture. Any changes to the Order Object are communicated on line to Order Capture via the ASO_ORDER_FEEDBACK_PUB.UPDATE_NOTICE API. Order Capture in turn publishes the information to a queue that all the interested CRM products poll.
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