# Transformation of Outbound Messages

You can configure Substation ES to publish data generated by transaction processing applications, for example, outbound messages, by using the trigger MOI.

In this case, you assign a subject to the data. With this subject, the data can be delivered to TIBCO messaging applications subscribing to this subject. You can also specify how data in outbound messages is transformed to be suitable for delivery to TIBCO messaging applications. Since transaction processing applications cannot use a message subject to indicate the configuration to use when transforming the data in the buffer, you must instead specify a text string starting at a given offset.

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