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BR-CO-13 Invoice total without VAT must equal line total minus allowances plus charges

The Invoice total amount without VAT (BT-109) must equal the Sum of invoice line net amount (BT-106) minus the Sum of allowances on document level (BT-107) plus the Sum of charges on document level (BT-108).

Problem Description

ERROR

EN 16931 calculation and consistency rule (BR-CO)

Interactive pipeline

Click a stage to see what it checks, or type a rule ID to light up the stage that reports it.

Try:

BR-CO-13 EN 16931 calculation rule

Reported in stage 2: EN 16931 rules.

Level error: the report recommends rejecting the invoice.

Stage 2 · What it checks

  • The core business terms are present (BR-01 to BR-65).
  • Totals add up and related fields agree (BR-CO); codes and decimals are valid (BR-CL, BR-DEC).
  • Each VAT category is consistent: S, Z, E, AE, K, G, O, L, M (BR-S, BR-Z, BR-AE, BR-IC …).

Example codes

Typical fix

Recalculate totals and VAT from the line data, and correct the VAT category in the source data.

A validator checks an e-invoice in stages. First the file must be well-formed XML that matches the UBL or CII schema (XSD). Then the EN 16931 business rules run: BR core rules, BR-CO calculations, BR-CL code lists, BR-DEC decimals and VAT-category rules such as BR-S. Next come the national or network rules that BT-24 selects: BR-DE for XRechnung, PEPPOL-EN16931 for Peppol BIS Billing. The report lists every failed rule: one error means reject, warnings alone still mean accept. BR-CO-13: EN 16931 calculation rule, reported in the stage “EN 16931 rules”. Rule sets: KoSIT validator 1.6.3 with the XRechnung configuration of 31 Aug 2026 (EN 16931 artefacts 1.3.16), Peppol BIS Billing 3.0.21.

Context and Significance

BR-CO-13 checks the invoice total without VAT (UBL: cac:LegalMonetaryTotal/cbc:TaxExclusiveAmount; CII: ram:TaxBasisTotalAmount) exactly against BT-106 − BT-107 + BT-108. BR-CO-15 and BR-CO-16 each check their own equation with the BT-109 value stated in the file, so they do not fail automatically; a wrong BT-109 often leads to a wrong gross total or amount due as well. A typical cause is a document level allowance or charge that is included in BT-109 but missing from BT-107 or BT-108.

Solution

Recompute BT-109 = BT-106 − BT-107 + BT-108 (treat a missing BT-107 or BT-108 as zero) and write the result into the totals block (UBL: cbc:TaxExclusiveAmount; CII: ram:TaxBasisTotalAmount).

Quick actions

Validate XMLConvert invoice

Valid Examples

  • BT-106 = 200.00, BT-107 = 10.00, BT-108 = 5.00 → BT-109 = 195.00
  • BT-106 = 100.00, no allowances or charges → BT-109 = 100.00

Invalid Examples

  • BT-106 = 200.00, BT-107 = 10.00, BT-108 = 5.00 but BT-109 = 200.00
  • BT-109 left equal to BT-106 even though BT-107 > 0 and there are no charges

Affected Fields

BT-109 Invoice total amount without VAT
BT-106 Sum of invoice line net amount
BT-107 Sum of allowances on document level
BT-108 Sum of charges on document level

Validation Tools

Official KoSIT Validator

Run the official KoSIT validator with the XRechnung configuration to check EN 16931 and XRechnung rules.

Convert PDF to XRechnung

Find validation errors during conversion and review each correction.