Hi,
Please refer the below document for roles and responsibility
also there is very good blog written by Abhinav
Key Roles,Responsibilty,skills and real time issues faced by SAP Consultant in PI Landscape
Please refer the below blog for BIC
SAP PI/XI : Content conversion using Generator mapping functionality of SeeBurger : Part 1.
SAP PI/XI : Content Conversion using Generator mapping functionality of SeeBurger : Part 2.
regards,
Harish