 needs to be implemented and routed separately.
It doesn’t provide an immediate response.
SAP provides a middleware based on NetWeaver called the SAP NetWeaver Process Integration. SAP NetWeaver PI delivers a message in specific format called the Simple Object Access Protocol (SOAP-HTTP). This message contains a header and payload. The header contains general information such as the sender and receiver information and the payload contains the actual data.
System can communicate with SAP NetWeaver PI directly or with the use of adapters −