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🇪🇺 EN 16931 (EU Core) • SEVERITY: FATAL • BT-106 vs sum(BT-131)

How to Fix BR-CO-10: BT-106 vs sum(BT-131)

The subtotal (`LineExtensionAmount` / `BT-106`) in the invoice summary does not exactly equal the mathematical sum of all individual line item net amounts (`BT-131`). Even a €0.01 floating-point rounding difference from Excel, Stripe, or OCR triggers a fatal rejection.

📐 Official Schematron Specification & XPath Diagnosis for BR-CO-10

BR-CO-10 — BLOCKING REJECTION
Official Specification Rule
[BR-CO-10] Sum of Invoice line net amount (BT-106) = Σ Invoice line net amount (BT-131).
XPath: /ubl:Invoice/cac:LegalMonetaryTotal/cbc:LineExtensionAmount
Deterministic Remediation (How to Fix)
Recalculate BT-106 as the exact 2-decimal sum of all <cac:InvoiceLine><cbc:LineExtensionAmount> values.
❌ REJECTED XML STRUCTURE (TRIGGERS BR-CO-10)
<!-- Line 1 = 33.33, Line 2 = 33.33, Line 3 = 33.33 (Sum = 99.99) -->
<cac:LegalMonetaryTotal>
  <cbc:LineExtensionAmount currencyID="EUR">100.00</cbc:LineExtensionAmount>
</cac:LegalMonetaryTotal>
✅ COMPLIANT XML STRUCTURE (BR-CO-10 FIXED)
<cac:LegalMonetaryTotal>
  <cbc:LineExtensionAmount currencyID="EUR">99.99</cbc:LineExtensionAmount>
</cac:LegalMonetaryTotal>

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1. Document Header & Routing Identifiers XRECHNUNG 3.0.2
2. Seller Party & Mandatory Contact (BG-4 / BG-6 / BR-DE-2) BT-27 .. BT-43
3. Buyer Party & Peppol Endpoint (BG-7 / R010) BT-44 .. BT-55
4. Line Items & EN 16931 Mathematical Reconciliation (BR-CO-10 .. 16) BG-25 / BG-22

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Related EN 16931 (EU Core) Validation Rules

BR-CO-13

BT-109 (Invoice Total Without VAT)

[BR-CO-13] Invoice total amount without VAT (BT-109) = Σ Invoice line net amount (BT-131) - Sum of allowances on document level (BT-107) + Sum of charges on document level (BT-108).

Fix BR-CO-13 →
BR-CO-14

BT-110 vs sum(BT-117)

[BR-CO-14] Invoice total VAT amount (BT-110) = Σ VAT category tax amount (BT-117).

Fix BR-CO-14 →
BR-CO-15

BT-112 (Invoice Total With VAT)

[BR-CO-15] Invoice total amount with VAT (BT-112) = Invoice total amount without VAT (BT-109) + Invoice total VAT amount (BT-110).

Fix BR-CO-15 →
BR-CO-16

BT-115 (Payable Amount)

[BR-CO-16] Amount due for payment (BT-115) = Invoice total amount with VAT (BT-112) - Paid amount (BT-113) + Rounding amount (BT-114).

Fix BR-CO-16 →
BR-S-08

BT-116 (VAT Category Taxable Amount)

[BR-S-08] For each different value of VAT category rate (BT-119) where the VAT category code (BT-118) is "Standard rated" (S), the VAT category taxable amount (BT-116) MUST equal the sum of Invoice line net amounts (BT-131) of that rate.

Fix BR-S-08 →
BR-S-09

BT-117 (VAT Category Tax Amount)

[BR-S-09] The VAT category tax amount (BT-117) in a VAT breakdown (BG-23) where VAT category code (BT-118) is "Standard rated" shall equal the VAT category taxable amount (BT-116) multiplied by the VAT category rate (BT-119) rounded to two decimals.

Fix BR-S-09 →
BR-01

BT-24 (Specification Identifier)

[BR-01] An Invoice shall have a Specification identifier (BT-24).

Fix BR-01 →
BR-02

BT-1 (Invoice Number)

[BR-02] An Invoice shall have an Invoice number (BT-1).

Fix BR-02 →
BR-03

BT-2 (Invoice Issue Date)

[BR-03] An Invoice shall have an Invoice issue date (BT-2).

Fix BR-03 →
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