We are facing a challenge in Supplier rebate settlement (S/4HANA 1809). The system doesn't take into account small differences in supplier invoices during business volume determination in the settlement run. The invoice with a small difference has been posted only at the header level: e.g. invoice value = 510 EUR, instead of 511,3 EUR.
The invoice item amount is unchanged. The invoice difference has been posted with the DIF transaction key.
We can see 511,3EUR in the settlement document always as business volume.
How is possible to get the header invoice value as a business volume in this case? The accounting team doesn't want to change the invoice processing method.