Solution : https://service.sap.com/sap/support/notes/413269 (SAP Service marketplace login required)
Key words : 
newly added statement perform change_wbs_in_resb_and_afpo, additional key words cn 076, create message c2234, error message forbidding, program corrections procedure, cross-project change, project definition changed, wbs element assignment, program error, cross-project
Related Notes : 
       
| 539151 | Changing WBS element: System messages cannot be customized | 
| 524401 | Change of WBS element not updated on components | 
| 458299 | Termination GEN_TOO_MANY_CBS in SAPLCOKO | 
| 428052 | Settlement rule adjustment at WBS element change |