Solution : https://service.sap.com/sap/support/notes/428052 (SAP Service marketplace login required)
Key words : 
goods receipt completed => settlement rule, wbs element assignment, wbs element change, diagnosis                        settlement rule, settlement rule manually, attached program corrections, adjust settlement rule, settlement rule, program error, procedure                        adjust
Related Notes : 
       
| 835125 | WBS element change not updated in components | 
| 599271 | WBS element cannot be changed. Message C2246 | 
| 543054 | WBS element cannot be deleted | 
| 539151 | Changing WBS element: System messages cannot be customized | 
| 525009 | Manufacturing orders for WBS elements in results analysis | 
| 524401 | Change of WBS element not updated on components | 
| 413269 | CO02: Inheritance of WBS element from header to component |