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Define a Logical Port
The lower level networking requires that a system port number be associated with the RFC destination. The logical port identifies the port to which messages are sent. The logical port can only be used if an RFC Destination was previously created.
To define a logical port, use WE21, or alternatively, the following procedure:
*To define a logical port
1. In the Main screen, select Tools > Business Communication > IDoc-Basis > IDoc > Port Definition.
2. Select the Transactional RFC tree item and click Create.
3. On the toolbar, click New Entries.
4. Either select your own descriptive port name or let the system generate one.
5. Enter the IDoc version you want to send via this port, the RFC destination you just created, and a short description of your logical port, and then save the information.