Solution : https://service.sap.com/sap/support/notes/132685 (SAP Service marketplace login required)
Key words : 
additional key words sapmm08p, solution call transaction se11, attached source code corrections, material price change, wbs element field, choose 'change', field names, line items, enter 'saccit', choose 'edit >
Related Notes : 
       
| 335685 | CO documents or line items missing in sales order | 
| 193173 | MR2M: Error message F5568 in fiscal year change |