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Error

FX-SCH-A-000641: Add the tender or lot reference date format

In short

Error: fails the selected checks.

FX-SCH-A-000641 means a date on your tender or lot reference (BT-17, type code 50) is missing its format attribute. Add the attribute to qdt:DateTimeString with a code matching the date, such as 102 for YYYYMMDD.

On this page

What it means

This applies to qdt:DateTimeString inside ram:FormattedIssueDateTime of a header ram:AdditionalReferencedDocument whose ram:TypeCode is 50, under ram:ApplicableHeaderTradeAgreement. It checks only that format exists, so an empty attribute also passes. BT-17 identifies the tender or lot reference; this rule concerns its attached date.

Why it matters

The reference's date needs its own format declaration. The reference type code 50 does not describe how the date is written.

How to fix it

Find the affected tender or lot reference's qdt:DateTimeString and add a matching format attribute. Use format="102" for a full calendar date written as YYYYMMDD without separators. Do not merely add an empty attribute or remove the BT-17 reference. Correct the export and recheck the file.

Once the file is corrected, check it again for free: Validate a ZUGFeRD invoice

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice Beta

The rule as published

Attribute '@format' is required in this context.

Where this rule applies

Rule set Version
Factur-X 1.09 EXTENDED 1.0.9-2
ZUGFeRD 2.5 EXTENDED 2.5.2
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether FX-SCH-A-000641 still fails, and which other rules do.

Updated 6 November 2026