Outbound Processing 
Use
In outbound processing, document data is written to IDocs and sent to the receiving system.
Features
The message can be sent from the application to the IDoc Interface along two different paths:
indirect route using Message Control (MC): A series of conditions are checked to "find" the message. If one of these conditions is fulfilled, the message that was "found" is forwarded to the IDoc Interface using the corresponding Message Control record. This condition technique also allows the Message Control module to find and send more than one message. For more information on MC, see the SAP Library
Cross-Application Components
® General Application Functions
® Message Control.The
direct path from the application to the interface. Here, the application generates an IDoc which is transferred to the IDoc Interface using the MASTER_IDOC_DISTRIBUTE function module.
The IDoc Interface can send the IDocs to the EDI subsystem along different paths (receiver ports). Port selection also depends on the receiving system and the hardware used for the installation. For more information, see
Communication with Older Releases.