PEPPOL-EN16931-R120 — Invoice line net amount doesn't add up
What it means
The invoice line net amount doesn't add up: quantity × price (− allowances
- charges). This is Peppol's extra check on the same calculation EN 16931 requires via BR-24 — the line amount must match quantity times price, accounting for line-level allowances and charges.
How to fix it
Check that LineExtensionAmount is actually calculated as InvoicedQuantity × (item price / base quantity) + line charges − line allowances. This
error often comes from rounding or a forgotten line-level allowance/charge.
Example
Wrong: quantity 10, price 50.00, but LineExtensionAmount is stated as
400.00 (doesn't match 500.00).
Correct: LineExtensionAmount = 500.00.