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Warning

UBL-CR-138: Seller details should not carry a buyer-assigned account ID

In short

Warning: worth checking.

UBL-CR-138 means the seller details in your UBL file contain an account identifier assigned by the buyer (CustomerAssignedAccountID), which EN 16931 does not use. Remove it and, if the buyer needs the number, give it as a seller identifier (BT-29).

On this page

What it means

This rule checks that the seller (BG-4) does not carry cbc:CustomerAssignedAccountID directly inside cac:AccountingSupplierParty in a UBL invoice or credit note. That element holds the number the buyer has given the seller in their own records, often called a supplier number. EN 16931 has a seller identifier field (BT-29), but does not use this account-ID element.

Why it matters

EN 16931 provides the seller identifier (BT-29), rather than this separate buyer-assigned account-ID element.

How to fix it

Remove cbc:CustomerAssignedAccountID from cac:AccountingSupplierParty. If you need to retain the number as a seller identifier (BT-29), put it in cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification/cbc:ID. Confirm any identifier scheme with the buyer. Export the corrected file and check it again.

Once the file is corrected, check it again for free: Validate an invoice against EN 16931

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice

The rule as published

A UBL invoice should not include the AccountingSupplierParty CustomerAssignedAccountID

Where this rule applies

Rule set Version
EN 16931 (UBL) 1.3.17
EN 16931 (UBL credit note) 1.3.17
XRechnung 3.0 (UBL) 3.0.2
XRechnung 3.0 (UBL credit note) 3.0.2
Peppol BIS Billing 3.0 (invoice) 2026.5
Peppol BIS Billing 3.0 (credit note) 2026.5
SI-UBL 2.0 / NLCIUS (invoice) 2.0.3.13
SI-UBL 2.0 / NLCIUS (credit note) 2.0.3.13
France CTC (UBL invoice) 1.4.0-04
France CTC (UBL credit note) 1.4.0-04
CIUS-RO UBL Invoice 1.0.9 1.0.9
CIUS-RO UBL Credit Note 1.0.9 1.0.9
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether UBL-CR-138 still fails, and which other rules do.

Updated 6 November 2026