If you are using the managed callout programming model (by using a message-driven bean), this token is automatically managed by the IMS TM resource adapter. In the client-managed callout programming model (non-MDB application), the Java™ application must manage the correlation token and pass it back with the response by using the associated getter and setter methods. The managed callout programming model is, therefore, the simpler and preferred approach of the two.
This property is valid only when the interaction verb is set to SYNC_RECEIVE_CALLOUT.