Solution : https://service.sap.com/sap/support/notes/146074 (SAP Service marketplace login required)
Key words : 
additional key words vprs, description 'copy pricing elements, header conditions manually created, copy price information, credit memo items, debit memo items, field vbrp-wavwr, attached advance corrections, manual header conditions, invoice correction request
Related Notes : 
       
| 338775 | Cost with incorrect +/- sign in CO-PA | 
| 204130 | SIS update: Collective note | 
| 91012 | Incorrect plus/minus sign for copied documents |