BR-05 — Missing currency code
What it means
The invoice currency code is missing (e.g. EUR). Without it, there's no way to tell what currency all the amounts in the invoice are stated in.
How to fix it
Check that the invoice XML contains a DocumentCurrencyCode element with
a valid ISO 4217 code (usually EUR in Latvia). This field usually fills
in automatically based on the company's default currency in the
accounting software.
Example
Wrong: the DocumentCurrencyCode element is missing.
Correct: <cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode>.