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Error

FX-SCH-A-000621: Check the line period end date format

In short

Error: fails the selected checks.

FX-SCH-A-000621 means the format code on your line period end date (BT-135) is not allowed by the Factur-X or ZUGFeRD EN 16931 profile. For a full calendar date, use format 102 and write the date as YYYYMMDD.

On this page

What it means

This checks the format attribute of udt:DateTimeString in ram:EndDateTime under the line's ram:SpecifiedLineTradeSettlement/ram:BillingSpecifiedPeriod. The line period is BG-26, with start date BT-134 and end date BT-135. An empty format value passes this check; a non-empty value must be on the profile's allowed list.

Why it matters

The format code tells software how to interpret the date text. The code and the way you write the date need to agree.

How to fix it

Correct the format attribute on this end date, not the start date or invoice date. For format="102", write the actual end date as eight digits in YYYYMMDD order, without separators. If your software generates the XML, have its export corrected, then 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

Value of '@format' is not allowed.

Where this rule applies

Rule set Version
Factur-X 1.09 EN 16931 1.0.9-2
ZUGFeRD 2.5 EN 16931 2.5.2
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether FX-SCH-A-000621 still fails, and which other rules do.

Updated 6 November 2026