CFDI error 307: XML schema validation rejected by SAT

TL;DR — Quick Summary

CFDI SAT error 307: XML schema validation fails when stamping. Fix namespaces, SAT catalogs, complements, and XSD version before resubmitting to your PAC.

Diagram

CFDI error 307 means the invoice XML failed schema validation required by SAT before or during PAC stamping. Unlike business-rule rejections or certificate errors (401), 307 is structural: the file does not match the official XSD for the invoice version, its complements, or referenced catalog keys. Until schema validation passes, no TimbreFiscalDigital is added and there is no UUID.

Common triggers include SAT schema updates, ERP version mismatches, and custom XML templates not aligned with CFDI 4.0. This guide covers the message, technical causes, and recovery steps.

The Error

When sending XML to the PAC or ERP stamping service you may see:

307 - XML schema validation error

Element ‘cfdi:Comprobante’ is invalid according to XSD

Attribute ‘Version’ does not match declared namespace

Complement node does not comply with published schema

Some PACs return an approximate XPath; others only show generic 307, forcing full validation with the SAT schema tool.

Cause of the Problem

Schema validation enforces:

Required node order and presence in XSD.
Data types (decimal with dot, ISO 8601 dates).
Max lengths on attributes.
Namespaces for CFDI 4.0 and nested complements.
Catalog keys required in later validation steps.

Outdated CFDI version or namespace

Templates still on 3.3 while stamping expects 4.0, or Version="4.0" with a 3.3 namespace, fail immediately. Missing ERP patches after SAT publications produce the same result.

Missing or misspelled required attributes

Frequent CFDI 4.0 gaps:

Exportacion on the invoice.
ObjetoImp on each line item.
RegimenFiscalReceptor and DomicilioFiscalReceptor when required.
Incorrect tax breakdown under Impuestos.

Custom attribute names (UsoCfdi vs UsoCFDI) also trigger 307.

Misstructured complements

Independent XSD files apply to Payments 2.0, Carta Porte 3.0, Payroll 1.2, and Foreign Trade. Wrong nesting under cfdi:Complemento, incompatible complement version, or removed nodes cause 307 even when the main body is valid.

Format values that look “almost” correct

European comma decimals.
Incomplete timestamps.
Unescaped & or control characters from PDF copy-paste.
Receiver RFC with spaces breaking XSD patterns.

Broken generation in integrations

String-concatenation APIs often omit closing tags or duplicate namespaces. EDI → CFDI and e-commerce mappers are weak points when SAT publishes new XSD files.

Step-by-Step Solution

1. Isolate rejected XML and PAC message

Export the failing XML and save PAC screenshots with date, issuer RFC, and internal folio. For nightly batches, check ERP or service logs.

2. Confirm invoice type and applicable XSD

Identify CFDI version, document type (income, credit, transfer, payment), and complements. Download current XSD packages from sat.gob.mx.

3. Validate with SAT tooling

Fix in order: namespaces and xsi:schemaLocation, missing nodes, invalid attribute types. Repeat until schema validation is clean.

4. Review catalogs and business rules

Validate product and unit keys, CFDI use vs receiver regime, and issuer ZIP even if XSD passes—some PACs map catalog failures to 307. Read the full text detail.

5. Fix ERP template and test stamp

Apply vendor patches, regenerate XML (avoid manual production edits), and stamp a symbolic live invoice. Confirm UUID, stamped XML download, and optional SAT CFDI lookup.

Prevention

Monitor SAT schema announcements quarterly.
Keep a low-volume test stamping path after ERP updates.
Run XSD validation in CI if you generate XML in-house.
Never edit stamped XML; regenerate pre-stamp.
Enable only licensed, updated complements.

Summary

Error 307 means XML does not match CFDI or complement XSD.
Check 4.0 version, namespaces, and required nodes before blaming the PAC.
Use SAT validation, fix catalogs, regenerate from ERP.
A test invoice confirms schema acceptance.

Guide & Instructions

Estimated Time: 40m

Tools Needed:

SAT Validator
PAC
ERP
XML Editor

Capture the exact PAC or SAT message

Copy the full 307 error text, referenced line or node, and CFDI version you are stamping. Store the rejected XML in an incident folder.

Identify XSD version and invoice type

Confirm CFDI 4.0 income, credit note, transfer, or complement invoice. Download the matching official XSD package from the SAT portal.

Validate XML with the SAT schema tool

Load the XML in the SAT schema validator. Fix namespaces, node order, required attributes, and max lengths for each reported issue.

Review catalogs and issuer data

Verify product keys, unit, CFDI use, tax regime, place-of-issue ZIP, and receiver RFC against current SAT catalogs.

Regenerate from ERP and test stamp

Apply fixes in Aspel, CONTPAQi, or your billing system, build a fresh XML, and stamp a minimal test invoice until UUID is issued without 307.

Frequently Asked Questions

What does CFDI error 307 mean?

SAT or the PAC reports the XML does not comply with the current XSD schema: missing attributes, wrong namespaces, out-of-catalog values, or invalid node structure before stamping.

Is error 307 the same as 401 or 302?

No. 307 is XML schema validation; 401 usually relates to CSD certificate; 302 often involves complement chain issues. Read the full PAC detail message.

How do I validate XML before stamping?

Use the SAT XSD validator for your invoice version, check c_ClaveProdServ, c_UsoCFDI, and c_RegimenFiscal catalogs, and ensure the ERP emits the correct CFDI 4.0 namespace.

Do complements often cause error 307?

Yes. Carta Porte, Payroll, Payments, and Foreign Trade have their own XSD. A mis-nested child node or obsolete complement attribute invalidates the whole invoice.