CII-DT-024:Date element missing format="102" attribute
Fix: Convert every CII date to eight-digit CCYYMMDD and add format="102" on the udt element. Upload your invoice to fix this automatically.
CII-DT-024 is an EN 16931 datatype assertion on the CII binding. Every udt:DateTimeString or udt:DateString must carry format="102" — the UN/EDIFACT code for an eight-digit CCYYMMDD date.
Engine Classification
Structural normalization · No financial impact · Safe deterministic remediation
Confidence: 97% · Applied automatically in pipeline
What is CII-DT-024?
CII-DT-024 is a fatal validation rule defined in the cii-d16b specification.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Why This Error Matters
A single required date format eliminates ambiguity across thousands of accounting systems. Without format="102", receivers cannot reliably parse the date.
CII-DT-024 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Fails CII schema validation
- ·Error returned: CII-DT-024
- ·Specification: cii-d16b
Before / After
<ram:IssueDateTime><udt:DateTimeString>2026-04-20</udt:DateTimeString></ram:IssueDateTime>
<ram:IssueDateTime><udt:DateTimeString format="102">20260420</udt:DateTimeString></ram:IssueDateTime>
Technical Reference
Seeing this in production? The API handles CII-DT-024 automatically. See the fix response →
Frequently Asked Questions
EN 16931 narrows CII to a single date format so every receiver across Europe interprets dates identically.
Yes. Converting ISO 8601 to CCYYMMDD is deterministic and reversible, and format="102" is the only permitted value. Invoice Navigator applies this fix automatically.
Yes — IssueDateTime, DeliveryChainEvent/OccurrenceDateTime, BillingSpecifiedPeriod boundaries, DueDateDateTime, and document reference issue dates.
Strip the time component. EN 16931 CII dates are date-only.
Yes. EN 16931 Schematron is enforced for ZUGFeRD 2.x and Factur-X from BASIC upwards.
Related Content
Last updated: 20 April 2026
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