The SAP HR/HCM source supports the Person External ID being associated with the employee. By default, the Person External ID attribute is not present in the schema. To aggregate the Person External ID, complete the following:
This is the companion discussion topic for the documentation at https://documentation.sailpoint.com/connectors/sap/hr_hcm/help/integrating_sap_hr_hcm/person_external_id.html