Need Help on Integration of R/3 , BI and SAP SEM-BCS

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Hi All SAP Gurus,

Please help me out how do I configure or integrate SAP R/3, SAP BI and SAP SEM-BCS. Please clear me the whole scenario. What is the work of BI consultant and FI consultant in these integration process?????

Thanks and Regards,
Rajib Debbarma