Solution : https://service.sap.com/sap/support/notes/1263018 (SAP Service marketplace login required)
Key words : 
software component   ea-hrgxx                      ea-hr general, create customer specific entries, view cluster maintenance transaction, choose 'define target dates, potential period            target type, performance period            target type, 'define target dates, view cluster hrtmc_vc_period, sap standard entries, target date type
Related Notes : 
       
| 1156407 | SAP ERP Enhan.Pk.4 SP Stack 01(11/2008) - Release Info. Note |