Solution : https://service.sap.com/sap/support/notes/639596 (SAP Service marketplace login required)
Key words : 
ps master data transaction, depreciation simulation data, execute status, wbs elements, terms cj02, cj20nstatus reason, program error, error occurs, wbs element, solution implement
Related Notes : 
       
| 688179 | |
| 549762 | Status changes of WBS elements are not saved | 
| 495726 | Overall plan incrct if WBS elemnt w/ deletn flag in project |