How do I fix SDI-00400 (AliquotaIVA & Natura Conflict) automatically?

Repair AliquotaIVA & Natura Conflict in the XML payload and re-validate before re-submitting to SdI or Peppol. You can upload your rejected XML or PDF invoice in the workbench on this page and click "1-Click Auto-Fix All Errors" to repair SDI-00400 immediately.

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🇮🇹 Italy FatturaPA / SdI • SEVERITY: FATAL • AliquotaIVA & Natura Conflict

How to Fix SDI-00400: AliquotaIVA & Natura Conflict

Italian SdI gateway rejected the XML invoice with error code SDI-00400 (AliquotaIVA & Natura Conflict).

📐 Official Schematron Specification & XPath Diagnosis for SDI-00400

SDI-00400 — BLOCKING REJECTION

Official Specification Rule

[SDI-00400] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: If AliquotaIVA is 0%, the Natura tax exemption code (N1–N7) must be provided; if >0%, Natura must be omitted.

XPath: /p:FatturaElettronica/FatturaElettronicaBody

Deterministic Remediation (How to Fix)

Repair AliquotaIVA & Natura Conflict in the XML payload and re-validate before re-submitting to SdI or Peppol.

❌ REJECTED XML STRUCTURE (TRIGGERS SDI-00400)

<!-- Scarto SdI Codice SDI-00400: AliquotaIVA & Natura Conflict -->

✅ COMPLIANT XML STRUCTURE (SDI-00400 FIXED)

<!-- FatturaElettronica XML Verified (SDI-00400 RESOLVED) -->

⚡ Repair SDI-00400 in Your Invoice Right Now:

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1. Document Header & Routing Identifiers XRECHNUNG 3.0.2

Invoice No BT-1

Issue Date BT-2

Due Date BT-9 / BR-DE-26

Buyer Ref / Leitweg-ID BT-10 / BR-DE-15

Currency & ZATCA UUID BT-5 / KSA-1

2. Seller Party & Mandatory Contact (BG-4 / BG-6 / BR-DE-2) BT-27 .. BT-43

Seller Legal Name BT-27

Seller VAT / 15-Digit ZATCA TIN BT-31 / BR-KSA-08

Contact Person BT-41 / BR-DE-5

Contact Phone BT-42 / BR-DE-6

Contact Email BT-43 / BR-DE-7

Seller EndpointID BT-34 / R020

Building # (ZATCA) KSA-17

SEPA Payee IBAN BT-84 / BR-DE-23

3. Buyer Party & Peppol Endpoint (BG-7 / R010) BT-44 .. BT-55

Buyer Legal Name BT-44

Buyer VAT ID BT-48

Buyer EndpointID BT-49 / R010

4. Line Items & EN 16931 Mathematical Reconciliation (BR-CO-10 .. 16) BG-25 / BG-22

Net Total BT-109 / BR-CO-13

VAT Total BT-110 / BR-S-09

Payable Gross BT-112 / BR-CO-15

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UTF-8 • OASIS UBL 2.1 / EN 16931

Related Italy FatturaPA / SdI Validation Rules

SDI-00401

Natura Present With Non-Zero VAT

[SDI-00401] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: Natura code is present on a line item that has a VAT rate greater than 0%.

Fix SDI-00401 →

SDI-00403

Duplicate FatturaPA Invoice Number

[SDI-00403] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: An invoice with the same Number and Year from the same Seller VAT ID was already submitted to SdI.

Fix SDI-00403 →

SDI-00417

Missing Fiscal Code / Partita IVA

[SDI-00417] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: Neither IdFiscaleIVA nor CodiceFiscale was provided for the CessionarioCommittente (Buyer).

Fix SDI-00417 →

SDI-00423

PrezzoTotale Calculation Mismatch

[SDI-00423] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: Line item PrezzoTotale does not equal Quantita * PrezzoUnitario (adjusted for ScontoMaggiorazione).

Fix SDI-00423 →

SDI-00460

ImportoBollo Duty Stamp Error

[SDI-00460] Agenzia delle Entrate Sistema di Interscambio (SdI) rejection error: Virtual stamp duty (Bollo Virtuale €2.00) is required or misformatted on exempt invoices exceeding €77.47.

Fix SDI-00460 →

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