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Fatal

BR-DEX-05: Company registration scheme must be an ISO 6523 code

In short

Fatal: fails the selected checks.

BR-DEX-05 means the scheme code on a legal registration identifier is not a valid ISO 6523 code. Fix it by using a single code from the ISO 6523 ICD list, with no spaces.

On this page

What it means

A legal registration identifier of a party (for example the seller's company number BT-30 or the buyer's BT-47) carries a scheme code, such as BT-30-1, that says which register the number comes from. The code must be a single code from the ISO 6523 ICD list used by the XRechnung extension, with no spaces. Unlike the party identifier rule BR-DEX-04, SEPA is not allowed here. The rule only runs on invoices that use the XRechnung extension, and XRechnung CII files are checked the same way.

Why it matters

The scheme code tells the recipient which register the company number belongs to. A code that is not on the list cannot be interpreted, so the invoice fails validation and is rejected.

How to fix it

Find the company registration number in the company details of your invoicing software and check its type or scheme. Pick the four-digit ICD code for the register the number comes from, for example 0002 for a French SIREN number or 0106 for a Dutch KvK number, and remove any spaces or extra text. If you do not need the registration number on the invoice, remove it.

The rule as published

Any scheme identifier in MUST be coded using one of the ISO 6523 ICD list.

Where this rule applies

Rule set Version
XRechnung 3.0 (UBL) 3.0.2
XRechnung 3.0 (UBL credit note) 3.0.2
XRechnung 3.0 (CII) 3.0.2
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether BR-DEX-05 still fails, and which other rules do.

Updated 6 November 2026