https://userapps.support.sap.com/sap/support/knowledge/en/3738893
3738893 - CX_SY_REF_IS_INITIAL during Business Partner relationship replication from MDG to CRM...
When replicating a Business Partner relationship from MDG to CRM, the message fails with exception CX_SY_REF_IS_INITIAL, which can be seen via transaction...