The CME requires that all iLink transactions set the FIX SenderSubID header field (tag 50) to a value that uniquely identifies the trader or automated system that initiated the transaction. Typically this will be the login ID of the trader responsible. Applications using the FIX adapter with iLink must therefore set the "ownerId" field of all com.apama.oms.NewOrder events sent to the adapter to an appropriate value. This value will be used as the SenderSubID for all outgoing messages related to a given order, and recorded in the audit log. NewOrder events without a valid "ownerId" field will be rejected by the iLink preprocessor service monitor.