You can edit a JMS definition to reflect changes in the source or target data. For example, you can edit JMS message header, property, or body fields. You can add and remove fields. You can also change the JMS message type.
When you change the message type, the structure of the source or target definition changes. For example, if you edit the source or target definition to represent the message type TextMessage, the Designer adds a body field to the source or target definition. You can also add any number of property fields.