Solution : https://service.sap.com/sap/support/notes/167170 (SAP Service marketplace login required)
Key words : 
additional key words co10, status i0002 'created', wbs element assigned, wbs element, production order, prerequisites solution, implement note 65941, consequence, correction, implementation
Related Notes : 
       
| 362416 | |
| 357315 | |
| 313230 | Operation release possible although WBS created | 
| 65941 |