id='xadesSignedProperties validate

Signing process
1

Dear Support Team,

I am facing a ZATCA Phase 2 e-invoicing validation issue related to XML digital signature and signed properties hashing, and I need guidance on how to correct it.

Summary of the Issue

  • Invoice XML is generated correctly and passes XSD, EN, KSA, and QR validations

  • The issue occurs only at the signature level

  • ZATCA API and Fatoora SDK both report invalid SignedProperties hashing

  • As a result, PIH validation also fails

ZATCA API Error

From ZATCA API response:

Invalid signed properties hashing, SignedProperties with id='xadesSignedProperties'

Fatoora SDK Validation Result (Java SDK 3.4.8)

When validating the same XML using:

fatoora generate -invoice 311218730900003_20260106_9.xml -validate

I receive the following errors:

[SIGNATURE] validation result : FAILED
CODE : xadesSignedPropertiesDigestValue
MESSAGE : wrong xadesSignedPropertiesDigestValue

CODE : signatureValue
MESSAGE : wrong signature Value

[PIH] validation result : FAILED
CODE : KSA-13
MESSAGE : PIH is inValid

What Is Working Correctly

  • XML structure (UBL 2.1) :check_mark:

  • Invoice data and totals :check_mark:

  • QR code generation :check_mark:

  • Certificate is loaded and used :check_mark:

  • Invoice hash is generated :check_mark:

Where the Problem Seems to Be

Based on the errors, the problem appears to be related to XAdES signing, specifically:

  1. Canonicalization of <xades:SignedProperties>

  2. Digest calculation for SignedProperties

  3. Reference URI or ID mismatch

  4. SignatureValue calculated over incorrect canonical data

  5. PIH calculated using an incorrect final invoice hash

Because the SignedProperties digest is wrong, the signature becomes invalid, and consequently the PIH hash also fails validation.

What I Need Help With

I would appreciate guidance on the correct method to generate and sign XAdES SignedProperties, specifically:

  • Correct canonicalization method required by ZATCA (C14N type)

  • Exact structure and required attributes for <xades:SignedProperties>

  • How to correctly calculate:

    • xadesSignedPropertiesDigestValue

    • SignatureValue

    • PIH based on the signed invoice

  • Common mistakes to avoid when signing invoices programmatically

If possible, a sample reference implementation or step-by-step signing flow would be extremely helpful.

Environment Details

  • Invoice Type: B2C (Simplified)

  • SDK Used for Validation: ZATCA Fatoora Java SDK 3.4.8

  • Implementation Language: PHP

  • OS: **Windows (XAMPP)

    but i make this xml using php and codeigniter
    i get this error and tell me how i set that
    **

My integration date is limited plz reponse as soon as possible

Thank you for your time and support. I am very close to completion and only need help correcting the signature and signed properties hashing to become fully compliant.

Best regards
Ali