Number ranges can be defined independently in SAP Sales and Service Cloud and SAP S/4HANA. Confirmation Messages help to write ID Mappings of replicated objects.
Integrating Business Partners with SAP ERP requires additional configuration:
When a new business partner is created in SAP Sales and Service Cloud and sent to SAP ERP there is no confirmation IDoc. Hence SAP Sales and Service Cloud does not get information about the assigned ERP number.
SAP Sales and Service Cloud needs to draw an ERP customer, prospect, or contact number before replication and write ID mapping.
A fine-tuning option is available to define the ERP number range used for customer, prospect, or contact creation in SAP Sales and Service Cloud (must be the same as configured in SAP ERP).