SAP PI XI PO Online / In-Class Training SAP PI XI (Process Integration based on Exchange Infrastructure). It takes the responsibility of integrating different SAP and non-SAP systems in the Heterogeneous Landscape (network of different computers). PI acts as SOA Middleware and forms the backbone of SOA in SAP environment. Process Integration can be used as a Middleware Engine to communicate in a distributed environment. The heart of PI is Integration Engine that is used for integrating different technologies using Standard Messaging techniques, e.g XML. Different mapping tools are available for mapping the distributed system which can be mapped without having any expertise of Technical Details. As a real world example, PI can be helpful in integrating different banks with SAP R/3. PI also support previous releases of SAP R/3 like 4.6C and have many more adapters to communicate with legacy systems.