Skip to content
Change language: English

Warning

UBL-CR-201: The buyer's own account number should be left out

In short

Warning: worth checking.

UBL-CR-201 means the buyer in your UBL file has an account identifier that the buyer assigned to itself (CustomerAssignedAccountID), which EN 16931 does not use. This is a warning. Remove cbc:CustomerAssignedAccountID from cac:AccountingCustomerParty. If you still need to include the number, use a standard field that matches its purpose.

On this page

What it means

The rule checks the buyer block (cac:AccountingCustomerParty) in a UBL invoice or credit note and warns when it contains cbc:CustomerAssignedAccountID, an account number the buyer has given itself. EN 16931 identifies the buyer with the buyer identifier (BT-46, in cac:PartyIdentification) and lets you add the buyer reference (BT-10) and the purchase order number (BT-13).

Why it matters

EN 16931 uses defined buyer identifiers and references rather than cbc:CustomerAssignedAccountID. An empty element also triggers this warning.

How to fix it

Remove cbc:CustomerAssignedAccountID from cac:AccountingCustomerParty. If you need to retain the number, choose the field that matches its purpose: the buyer reference (BT-10) for an internal routing reference from the buyer, the purchase order number (BT-13) for an order number, or the buyer identifier (BT-46) for an identifier of the buyer. Export again and recheck the file.

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 AccountingCustomerParty 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-201 still fails, and which other rules do.

Updated 6 November 2026