Hi Panduranga,
Business partners can also exist in ECC.
From CRM, we send business partner to ECC using BUPA_MAIN, but whether it turns to ECC customer or ECC BP depends on which FM you register for R3OBI BUPA in ECC table COM_BUPA_CALL_FU.
If you activate PI_BP_PROXY_BAPI_CUSTOMER here, the CRM BP will be mapped to ECC Customer. If you activate COM_BUPA_MAIN_BP_INBOUND, the CRM BP will be replicated to ECC BP.
There are also other FM used for special industry solutions, IS-M, IS-U, ect. to replicate to both BP and customer.
Usually ONLY one FM should be activated for R3OBI BUPA. Please do not activate PI_BP_PROXY_BAPI_CUSTOMER and COM_BUPA_MAIN_BP_INBOUND at the same time,as this could cause problem.
If you do not use IS-M or IS-U industry solutions and still want to synchronize ECC BP and ECC cusstomer, so the CVI integration should be used.
In that scenario, you can replicate CRM BP to ERP customer, and then use CVI to synchronize ERP customer to ERP BP.
Best Regards,
Ellen