This property specifies which type of callout request messages
the Java™ application is to retrieve.
Valid values are:
- CALLOUT_REQUEST_ASYNC (default): To retrieve only asynchronous
callout request messages.
- CALLOUT_REQUEST_SYNC: To retrieve only synchronous callout request
messages.
- CALLOUT_REQUEST_BOTH: To retrieve both synchronous and asynchronous
callout request messages.
This property is only valid when the interaction verb
is set to SYNC_RECEIVE_CALLOUT.