MDG-F integration with Central finance and S/4HANA

Dear Team,

This is SAP MDG-F 8.0 integrated Central finance with S/4HANA.

Please see the below landscape of MDG Step 2 which Highlighted with Red, any idea why the integration may required from “SAP ERP to MDG system”.

How to replicate from MDG system to Central finance for Business Mapping(S/4HANA).

Regards,

A.Madhu Kumar