Skip to content

Error

FX-SCH-A-000524: Use an allowed due date format code

In short

Error: fails the selected checks.

FX-SCH-A-000524 means the format attribute on the due date (BT-9) contains a code that is not allowed. For a date written as YYYYMMDD, set format="102" on udt:DateTimeString inside ram:DueDateDateTime, then export and recheck your file.

On this page

What it means

In the Basic profiles of Factur-X and ZUGFeRD, this rule checks a non-empty format attribute on ram:SpecifiedTradePaymentTerms/ram:DueDateDateTime/udt:DateTimeString against the permitted date format codes. Code 102 describes an eight-digit date in year, month and day order without separators. This rule checks the format code, not the date text or whether a due date is present.

Why it matters

The format code tells software how to interpret the due date text. The declared format and the date text need to describe the same representation.

How to fix it

Check the exported due date element. If the date uses YYYYMMDD, put format="102" on udt:DateTimeString within ram:SpecifiedTradePaymentTerms/ram:DueDateDateTime. Ensure the date text follows that pattern. If your invoicing software generates the invalid attribute, report this rule id to its supplier. Export and recheck.

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

Value of '@format' is not allowed.

Where this rule applies

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

Check your file

Drop your e-invoice to see whether FX-SCH-A-000524 still fails, and which other rules do.

Updated 6 November 2026