we have now a first version of the migration object modeler available for SAP S/4HANA Cloud. Customers and Partner can register for the EAC (Early Adopter Care) program, if following prerequisites are met:
In general, you need additional fields for either migration object CUSTOMER or SUPPLIER. There are some fields that are released to be added by the migration object modeler.
For details which fields are available for CUSTOMER, please check SAP Note 3020259
For details which fields are available for SUPPLIER, please check SAP Note 3019787