Two-Action Responder
In this scenario, the partner will receive a message from XI. The partner will then respond back to XI with a message.
Since this scenario involves XI requesting a message and getting back a response from the partner, you define two communication channels, one as Receiver for the partner getting a message and another as Sender for the partner responding to XI.
For the Two-Action Responder scenario, the partner receiving the message from XI takes the role of Seller and XI takes the role of Buyer.
This scenario can be depicted as follows:

Configure the following objects for this scenario:
● Party
● Service