Two-Action Initiator
In this scenario, the partner will initiate or start a message exchange with XI. XI will send back a response message to the partner.
Since this scenario involves the partner requesting a message and getting back a response from XI, you define two communication channels, one as Sender for the partner requesting a message and another as Receiver for the partner to receive a response from XI.
For the Two-Action Initiator scenario, the partner initiating the message exchange with XI takes the role of Buyer and XI takes the role of Seller.
This scenario can be depicted as follows:

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