errorEN 16931

`BR-S-01`:Standard rate must be in VAT breakdown

If any line uses VAT category S, VAT breakdown must include S category.

Severity

Fatal

Rule set

EN 16931

Country

All EU

Fix type

BLOCKED

Engine Classification

Financial or legal field · Modification blocked by policy

What is BR-S-01?

BR-S-01 is a fatal validation rule defined in the EN 16931 specification. It validates the TaxCategory element under TaxTotal > TaxSubtotal in the UBL invoice XML.

When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.

Target path: XPath: /Invoice/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[cbc:ID="S"]

This error requires manual correction — financial fields are protected by policy.Get API Access

Why This Error Matters

Invoice will be rejected. Standard rated VAT (category S) requires seller VAT registration, positive VAT rate, and correct tax calculations. Missing elements prevent tax compliance verification.

BR-S-01 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.

Validator Behavior

·Causes invoice rejection
·Error returned: BR-S-01
·Specification: EN 16931

How to Fix It

Check line categories

Any line with TaxCategory S?

Add breakdown

Include TaxSubtotal for S with rate and amounts

Before / After

Failing XML

<Invoice>
  <cac:InvoiceLine>999.99</cac:InvoiceLine>
  <!-- Does not match expected calculation -->
</Invoice>

Corrected XML

<Invoice>
  <cac:InvoiceLine>100.00</cac:InvoiceLine>
  <!-- Matches expected calculation -->
</Invoice>

Technical Reference

XPathXPath: /Invoice/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[cbc:ID="S"]

SpecEN 16931

Strategy1. Find all lines/allowances/charges with this VAT category. 2. Ensure exactly one TaxSubtotal with matching category exists. 3. Create if missing.

Common Causes

·Standard rated (S) category used but no S breakdown exists
·Invoice lines use BT-151=S but BG-23 missing S entry
·cac:TaxSubtotal for standard rate not generated
·Tax breakdown section lacks mandatory S category
·Standard rated items require matching breakdown entry

Seeing this in production? The API handles BR-S-01 automatically. See the fix response →

Frequently Asked Questions

If any line uses VAT category S, VAT breakdown must include S category.

Add TaxSubtotal with TaxCategory/ID = "S". This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.

Yes, BR-S-01 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.

BR-S-01 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.

Detect BR-S-01 Before Submission

This error involves a financial or legal field that cannot be auto-modified. The compliance engine flags it immediately with a clear diagnosis so your team can fix it at the source.

Get API Access View API Documentation

BR-S-01:Standard rate must be in VAT breakdown