For each collaboration you wish to configure for a call-triggered flow, you must configure the port on the collaboration object.
To configure a collaboration port for a call-triggered flow:
The Configure port dialog opens. Its default setting for the Type of port is Internal, which enables bindings to connectors and collaborations.
Figure 5 shows editing the port binding in the outline view (right side) and the Configure port dialog that opens (left side).
This displays the Configure port (External) dialog box as shown in Figure 6. In the Configure As area, the dialog displays the type of port you have chosen to configure: Incoming if business object requests are received by the port or Outgoing if business object responses are sent out of the port.