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Error

FX-SCH-A-000726: The end user's tax registration identifier needs a scheme

In short

Error: fails the selected checks.

FX-SCH-A-000726 means ram:ID in one of the end user's tax registrations is missing its schemeID attribute. Add the scheme code that describes that registration, such as VA for a VAT number or FC for a national tax number.

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What it means

In the Extended profile of Factur-X and ZUGFeRD, ram:ID under ram:ProductEndUserTradeParty/ram:SpecifiedTaxRegistration must have a schemeID attribute. This rule checks only whether the attribute exists. It does not check its value, so an empty attribute also passes this particular test.

Why it matters

The scheme identifies the numbering system used for the tax registration. The profile requires the attribute alongside the identifier.

How to fix it

Find the affected ram:SpecifiedTaxRegistration under ram:ProductEndUserTradeParty. Add schemeID to its ram:ID and supply the scheme for the number you are including, for example schemeID="VA" for a VAT number or schemeID="FC" for a national tax number. Check the file again.

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 '@schemeID' 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-000726 still fails, and which other rules do.

Updated 6 November 2026