Solution : https://service.sap.com/sap/support/notes/72130 (SAP Service marketplace login required)
Key words : 
item &' additional key words xvbkd_positionen_aktualisieren, prerequisites program errorthis note, header business data, business data, header level, sales document, main items, advance corrections, note 50436, vbkd_fuellen_kvbkd
Related Notes : 
       
| 132817 | Business data is not transferred to subitem | 
| 50436 | Wrong pricing for subitems |