The Start Message event is used to model the beginning of an integration process that is triggered by an incoming message from a sender system. When an integration flow is configured with a sender SOAP adapter, the Start Message event is essential for creating the web service endpoint. Once the integration flow is deployed, this endpoint becomes active, allowing an external client to send a SOAP request at any time, thereby running the integration flow directly.

A. End Event: This event terminates a specific path within the integration process. It does not initiate the flow or receive incoming messages.

B. End Message: This event is used at the conclusion of a process to send a response message back to the original sender. It does not trigger the start of the flow.

C. Start Event: This is a generic, non-specific start event. It is typically used to begin a local integration process that is called internally by another process, not to expose an external endpoint for a SOAP adapter.

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1. SAP Help Portal

SAP Integration Suite Documentation: In the section on modeling basics

the "Start Message" event is described as the trigger for a process initiated by a sender. It states

"A message start event is triggered by a message from a sender. You connect a message start event to a sender participant through a channel." This directly links the event to an incoming message via an adapter like SOAP.

Source: SAP Help Portal

Cloud Integration -> Creating Integration Content -> Get Started with Integration Flow Design -> Define the Integration Flow Model -> Events -> Start Message Event.

2. SAP Help Portal

SAP Integration Suite Documentation: The documentation for configuring sender adapters explicitly shows the connection from a sender system to a Start Message event. For the SOAP adapter

this configuration is what exposes the integration flow as a web service.

Source: SAP Help Portal

Cloud Integration -> Creating Integration Content -> Configure Adapters -> Configure the Sender SOAP Adapter. The diagrams and configuration steps illustrate the adapter's connection to the Start Message event to receive requests.