UBL-CR-213: The buyer's address should not have a separate PO box field

What it means

The rule warns if cac:AccountingCustomerParty/cac:Party/cac:PostalAddress in a UBL invoice or credit note contains cbc:Postbox. In UBL that element holds the number of a post office box. EN 16931 has no separate field for it; the address is built from the address lines (BT-50, BT-51, BT-163), city, post code and country.

Why it matters

EN 16931 represents the postal address with address lines rather than a separate PO box element. You can retain PO box information as address text while removing cbc:Postbox.

How to fix it

If you need to keep the PO box, put it in the first or second address line (BT-50 or BT-51), for example 'PO Box 123'. In XML, use cbc:StreetName or cbc:AdditionalStreetName inside cac:AccountingCustomerParty/cac:Party/cac:PostalAddress. Preserve any address text already there, then delete cbc:Postbox from the same address. Export again and recheck the file.

The rule as published

A UBL invoice should not include the AccountingCustomerParty Party PostalAddress Postbox

Where this rule applies