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Depending on the SBE template, either 37708-OrderUpdateAction or tag 279-MDUpdateAction order action will be used for book updates. See the MBO Incremental Refresh SBE Message Processing section for MDP 3.0 - Market by Order - Book Management for more information.

A book is built from a series of data blocks which indicate whether an order is to be inserted (New), changed (Update), or removed (Delete). The incremental instruction approach assumes the use of the Market Data Incremental Refresh (tag 35-MsgType=X) message