1, Create RFC destination to PI in SM59.
Program ID should match what we set in XI_IDOC_DEFAULT_DESTINATION, and gateway service should be java gateway service
2, Create a Port in WE21
3, Create Partner Profile for logical system of PI with t-code WE20
4, Create Distribute Model for ECC->PI, t-code: BD64
5, Send a IDoc of material master data by t-code: BD10
Specify the message type and logical system
6, Check IDoc status in WE02
7, Check T-RFC status in SM58
If met error message like below, check the mult-Respository RFC. And if unauthorization error check the RFC user roles and type.