You can create an event handler to an Enterprise Information System (EIS) to handle new event types that did not exist when you first developed your message flow. Therefore, if a new event is provided by the EIS, you do not have to modify and retest the message flow.
To implement an event handler that you can enhance iteratively with new event types (that is, deploy new event types to the event handler), configure an SAPInput node to use secondary adapters. The set of secondary adapters can be extended at operational time without affecting any existing adapters.