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Error

FX-SCH-A-000425: Give each buyer tax registration one identifier

In short

Error: fails the selected checks.

FX-SCH-A-000425 means an existing buyer tax registration block contains no ram:ID element, or contains more than one. Keep one identifier in each ram:BuyerTradeParty/ram:SpecifiedTaxRegistration block; for the buyer's VAT number, this is BT-48.

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What it means

In the Basic WL, Basic, EN 16931 and Extended profiles of Factur-X and ZUGFeRD, each existing buyer ram:SpecifiedTaxRegistration must contain one ram:ID. This rule does not require the registration block itself or check the identifier's value or scheme.

Why it matters

Each tax registration block has one identifier so that its number is recorded in a single field.

How to fix it

Check the buyer's tax registration data. For a VAT registration, put the VAT number (BT-48) in one ram:ID under ram:BuyerTradeParty/ram:SpecifiedTaxRegistration. Correct missing or repeated ID elements. Remove an entire registration block only if that registration is not needed for your invoice. Export and recheck your 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 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 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-000425 still fails, and which other rules do.

Updated 6 November 2026