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Error

FX-SCH-A-000737: The sales agent can have only one tax registration

In short

Error: fails the selected checks.

FX-SCH-A-000737 means the sales agent has more than one ram:SpecifiedTaxRegistration block. Keep at most one tax registration for that sales agent. This rule does not tell you to prefer a VAT number over a national tax number.

On this page

What it means

In the Extended profile of Factur-X and ZUGFeRD, ram:SalesAgentTradeParty may contain zero or one ram:SpecifiedTaxRegistration. The test counts all these blocks, regardless of scheme, so a VAT registration and a national tax registration together exceed the limit.

Why it matters

The profile provides space for at most one tax registration in this sales agent block. Multiple registrations exceed that structural limit.

How to fix it

Check which tax registration you intend to include for the sales agent. In ram:SalesAgentTradeParty under ram:ApplicableHeaderTradeAgreement, keep the appropriate ram:SpecifiedTaxRegistration and remove additional registration blocks. Do not combine different registration numbers into one identifier. 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

Element 'ram:SpecifiedTaxRegistration' may occur at maximum 1 times.

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-000737 still fails, and which other rules do.

Updated 6 November 2026