Why do you manually populate the key mapping table (HRSFEC_D_EEKEYMP) in SAP SuccessFactors Employee Central...

To populate all employees' new SAP SuccessFactors Employee Central PERNR ID to SAP SuccessFactors Employee Central Payroll on employee rehire

To populate PERNR IDs from SAP SuccessFactors Employee Central to SAP SuccessFactors Employee Central Payroll

To create the mapping between employee and manager to support workflows

To avoid the creation of new employees in SAP SuccessFactors Employee Central Payroll, which contains employee data already