Hi Prasad.
The BP replications are controlled through the SM30 view : CRMC_BUT_CALL_FU. Here an FM : BUPA_OUTBOUND_BPS_FILL_CENTRAL is responsible for filling up all the data in the outbound queue to ECC.
1. You could either implicitly enhance this module or
2(Better option). You can create a Z - FM in this view under the event TOMTC , object : BUPA . These are called at the end when the whole conversion of data is ready from CRM side. You can refer to : CRM_BUPA_SALES_AXT_TO_BAPIMTCS for help.
Regards,
Hasan Rafiq