Hi,
Replication object for CRM To ECC is BUPA_REL for relationship replication but before sending contact person relationship you have to send contact person for that replication object is bupa_main
goto txn: R3AR2
Create Request for object BUPA_MAIN
Table Name BUT000 Field Name PARTNER
than run via r3ar4
source CRM Target ECC
after successfully replication than
create request for relationship object name BUPA_REL
Table Name BUT050 Field Name PARTNER1 or PARTNER2
source CRM Target ECC
check bdoc status
Regards,
Vaibhav Shah