Stop Replication of Contact Person from CRM to ECC

Hello All

I need to stop the replication of Contact Person from CRM to ECC.

This is my current Scenario

1) Customers are created in ECC and Replicated to CRM. (Vice Versa is disabled)

2) Contact Person are created in ECC and Replicated to CRM

3) Contact Person created in CRM are also getting replicated to ECC

Now we do not want the last scenario. We not want CRM to ECC Contact person Replication

Please advice on what needs to be done to accomplish this requirement.