From c260313c23618aecdfe72ba12ef14b1db4f4322b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 4 Feb 2026 10:03:48 +0100
Subject: [PATCH] Use the legal notice of tax as tax exemption reason in UBL
 invoice

Closes #14572
---
 modules/edocument_ubl/edocument.py        | 6 ++++--
 modules/edocument_ubl/template/2/base.xml | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/edocument_ubl/edocument.py b/modules/edocument_ubl/edocument.py
index 9f5cd29148..13718613f0 100644
--- a/modules/edocument_ubl/edocument.py
+++ b/modules/edocument_ubl/edocument.py
@@ -190,14 +190,16 @@ class Invoice(Model):
     def taxes(self):
         class Tax(namedtuple(
                     'Tax',
-                    ('type', 'rate', 'unece_category_code', 'unece_code'))):
+                    ('type', 'rate', 'unece_category_code', 'unece_code',
+                        'legal_notice'))):
             @classmethod
             def from_line(cls, line):
                 return Tax(
                     type=line.tax.type,
                     rate=line.tax.rate,
                     unece_category_code=line.tax.unece_category_code,
-                    unece_code=line.tax.unece_code)
+                    unece_code=line.tax.unece_code,
+                    legal_notice=line.legal_notice or '')
         TaxLine = namedtuple('TaxLine', ('base', 'amount', 'tax'))
         for group, lines in groupby(sorted(
                     self.invoice.taxes,
diff --git a/modules/edocument_ubl/template/2/base.xml b/modules/edocument_ubl/template/2/base.xml
index bb14b39e8c..c94dceaf95 100644
--- a/modules/edocument_ubl/template/2/base.xml
+++ b/modules/edocument_ubl/template/2/base.xml
@@ -84,6 +84,7 @@ this repository contains the full copyright notices and license terms. -->
     <py:def function="TaxCategory(tax)">
         <cbc:ID py:if="tax.unece_category_code">${tax.unece_category_code}</cbc:ID>
         <cbc:Percent py:if="tax.type == 'percentage'">${format((tax.rate * 100).normalize(), 'f')}</cbc:Percent>
+        <cbc:TaxExemptionReason py:if="tax.legal_notice">${tax.legal_notice}</cbc:TaxExemptionReason>
         <cac:TaxScheme py:if="tax.unece_code">
             <cbc:ID>${tax.unece_code}</cbc:ID>
         </cac:TaxScheme>