SII-001:Clave de régimen especial missing
SII requires a regime key (clave de régimen especial) for each invoice indicating the type of operation: 01=General, 02=Export, 03=Gold operations, etc.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Clave de Régimen Especial
What is SII-001?
SII-001 is a fatal validation rule defined in the SII specification (ESP national rules). It checks whether clave de régimen especial missing.
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.
Why This Error Matters
SII-001 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: SII-001
- ·Specification: SII
How to Fix It
Technical Reference
Common Causes
- ·Missing regime key configuration
- ·Wrong code for operation type
- ·Intra-community not properly coded
Seeing this in production? The API handles SII-001 automatically. See the fix response →
Frequently Asked Questions
SII requires a regime key (clave de régimen especial) for each invoice indicating the type of operation: 01=General, 02=Export, 03=Gold operations, etc.
Set the correct clave de régimen especial for each invoice type. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, SII-001 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.
Many instances of SII-001 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including clave de régimen especial missing.
Last updated: 19 January 2026
Handle SII-001 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.