Skip to content
Change language: English

Error

FX-SCH-A-000637: Add the invoiced object reference date format

In short

Error: fails the selected checks.

FX-SCH-A-000637 means a date on your invoiced object reference (BT-18, type code 130) 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 130, under ram:ApplicableHeaderTradeAgreement. It checks only that format exists, so an empty attribute also passes. BT-18 identifies the invoiced object; this rule concerns the date attached to that reference.

Why it matters

The reference's date needs its own format declaration. The reference type code 130 does not describe how the date is written.

How to fix it

Find the affected 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 delete the invoiced object identifier. 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-000637 still fails, and which other rules do.

Updated 6 November 2026