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Integrating SAP XI 3.0 Business
Partners 
The following documentation describes how you can connect a business partner who uses SAP XI 3.0 to the SAP XI 3.0 Integration Server of another business partner.
Two SAP XI 3.0 Integration Servers are used to exchange messages between the system landscapes of two business partners.
Description
An SAP XI 3.0 Integration Server of a business partner is connected to the SAP XI 3.0 Integration Server of another business partner. Both use SAP XI 3.0 message protocol to send or receive messages.
When an SAP XI 3.0 Integration Server receives a message from another Integration Server it understands the message format and so processes the message.

A business partner that uses SAP XI 3.0 wants to send a message to another business partner who also uses SAP XI 3.0.
· The message is sent between the Integration Servers in SAP XI 3.0 message format
· The Integration Server of the second business partner then sends the message to the relevant business system