Solution : https://service.sap.com/sap/support/notes/100424 (SAP Service marketplace login required)
Key words :
additional key words vf01, billing type iv, condition type, intercompany billing, intercompany sales, sales order, system translates, document currency, local currency, company code
Related Notes :
| 136185 | Document currency change in the billing document |
| 78167 | Currency on item level (Workaround) |