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Error

FX-SCH-A-000406: The business process must have exactly one identifier

In short

Error: fails the selected checks.

FX-SCH-A-000406 means a business process block contains either no ram:ID element or more than one. Put the appropriate business process identifier (BT-23) in exactly one ram:ID within each existing block, then export and recheck the file.

On this page

What it means

This rule checks each ram:BusinessProcessSpecifiedDocumentContextParameter under rsm:ExchangedDocumentContext and requires exactly one ram:ID element. It applies in the Minimum, BASIC WL, Basic, EN 16931 and Extended profiles of Factur-X and ZUGFeRD. It counts ID elements in existing blocks; it does not check their text or require the block to be present.

Why it matters

A single identifier states which business process the document relates to without competing identifiers in the same block.

How to fix it

Check the business process identifier (BT-23) intended for your invoice. In the XML, add the missing ram:ID or remove duplicate IDs from ram:BusinessProcessSpecifiedDocumentContextParameter. If the block is not needed for your intended process and profile, remove it rather than leaving it empty. If your software creates the faulty block, ask its supplier to correct the export. 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

Element 'ram:ID' must occur exactly 1 times.

Where this rule applies

Rule set Version
Factur-X 1.09 MINIMUM 1.0.9-2
Factur-X 1.09 BASIC WL 1.0.9-2
Factur-X 1.09 BASIC 1.0.9-2
Factur-X 1.09 EN 16931 1.0.9-2
Factur-X 1.09 EXTENDED 1.0.9-2
ZUGFeRD 2.5 MINIMUM 2.5.2
ZUGFeRD 2.5 BASIC WL 2.5.2
ZUGFeRD 2.5 BASIC 2.5.2
ZUGFeRD 2.5 EN 16931 2.5.2
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-000406 still fails, and which other rules do.

Updated 6 November 2026