As far as I know there are 3 organization models within SAP World and each model may have diffenrent kind of keeping an object as employee. In case of CRM model, you can use these FMs:
- BUPA_CREATE_FROM_DATA to create a business partner. Employee must be a business partner.
- CRM_BUPA_CREATECENTRALPERSON to create a central person
- BUPR_EMPLO_CREATE to create an employee relationship