KSEF-008:GTU code missing
Certain goods/services require GTU (Grupy Towarów i Usług) classification codes. Required for alcohol (GTU_01), fuel (GTU_02), heating oil (GTU_03), tobacco (GTU_04), and other specific categories.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: GTU Classification Code
What is KSEF-008?
KSEF-008 is a warning validation rule defined in the KSeF specification (POL national rules). It checks whether gtu code missing.
This is a soft validation failure. The invoice may pass initial transmission, but non-compliant values in this field can cause problems during tax audits, buyer-side processing, or downstream VAT reconciliation.
Why This Error Matters
KSEF-008 is a soft failure. The invoice may pass initial validation, but the non-compliant field can cause issues at the receiving end — tax authorities may flag it during audits, buyer ERP systems may fail to process it, or VAT reconciliation may produce mismatches. Fixing warnings before they accumulate prevents larger compliance gaps.
Validator Behavior
- ·Generates validation warning
- ·Error returned: KSEF-008
- ·Specification: KSeF
How to Fix It
Technical Reference
Code Example
<GTU>GTU_01</GTU>Common Causes
- ·GTU requirement overlooked
- ·New product without GTU assignment
- ·GTU codes changed by regulation
Seeing this in production? The API handles KSEF-008 automatically. See the fix response →
Frequently Asked Questions
Certain goods/services require GTU (Grupy Towarów i Usług) classification codes. Required for alcohol (GTU_01), fuel (GTU_02), heating oil (GTU_03), tobacco (GTU_04), and other specific categories.
Assign GTU codes to products that require them. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
KSEF-008 is a warning that may not always cause rejection, but it indicates a potential compliance issue that should be addressed to ensure full compatibility.
Many instances of KSEF-008 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including gtu code missing.
Last updated: 19 January 2026
Handle KSEF-008 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.