How to Fix BR-28: EN 16931 Core Element #28
Your invoice violates European core rule BR-28 (EN 16931 Core Element #28). All EU national standards (XRechnung, ZUGFeRD, Factur-X, Peppol, KSeF, FatturaPA) enforce this rule as a hard blocker.
📐 Official Schematron Specification & XPath Diagnosis for BR-28
BR-28 — BLOCKING REJECTION<!-- Missing or invalid EN 16931 Core Element #28 at /ubl:Invoice (BR-28) -->
<!-- Validated EN 16931 Core Element #28 at /ubl:Invoice (BR-28 PASS) -->
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AUDITING...Related EN 16931 (EU Core) Validation Rules
BT-106 vs sum(BT-131)
[BR-CO-10] Sum of Invoice line net amount (BT-106) = Σ Invoice line net amount (BT-131).
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).
BT-110 vs sum(BT-117)
[BR-CO-14] Invoice total VAT amount (BT-110) = Σ VAT category tax amount (BT-117).
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).
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).
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.
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.
BT-24 (Specification Identifier)
[BR-01] An Invoice shall have a Specification identifier (BT-24).
BT-1 (Invoice Number)
[BR-02] An Invoice shall have an Invoice number (BT-1).
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