Solution : https://service.sap.com/sap/support/notes/208000 (SAP Service marketplace login required)
Key words :
additional key words debit memo request, incorrect billing status 'partially delivered', billing status 'partially delivered', sales document items nore, sales document item remains, credit memo request, document item differs, billing-due list, billing index vkdfs, function module unit_conversion_with_factorcauses
Related Notes :
| 193760 | Rounding error in UNIT_CONVERSION_WITH_FACTOR |
| 161493 | Billing due list after order-related billing doc. |
| 82004 | Billing due list after order-related billing |