get amount on line as net-value (even if invoice is gross-mode)

mixin.py

@@ -10,6 +10,7 @@ from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.tools import cached_property
 from trytond.pool import Pool
+from trytond.transaction import Transaction
 from trytond.modules.product import round_price
 
 
@@ -160,6 +161,41 @@ class EdocumentMixin(object):
                 taxname=tax.rec_name))
         return tax.unece_code
 
+    def get_line_amount(self, line):
+        """ get amount of current invoice-line,
+            depends on modegross of invoice, set used-modegross to 'net'
+
+        Args:
+            line (record): model account.invoice.line
+        """
+        if line.modegross == 'net':
+            return line.amount
+        elif line.modegross == 'gross':
+            # get net-amount
+            # copy from account_invoice/invoice.py:2416-2434
+            currency = (
+                line.invoice.currency
+                if line.invoice else line.currency)
+
+            amount = (Decimal(str(line.quantity or 0)) * (
+                line.unit_price or Decimal(0)))
+            invoice_type = (
+                line.invoice.type
+                if line.invoice else line.invoice_type)
+
+            if (invoice_type == 'in'
+                    and line.taxes_deductible_rate is not None
+                    and line.taxes_deductible_rate != 1):
+                with Transaction().set_context(_deductible_rate=1):
+                    tax_amount = sum(
+                        t['amount'] for t in line._get_taxes().values())
+                non_deductible_amount = (
+                    tax_amount * (1 - line.taxes_deductible_rate))
+                amount += non_deductible_amount
+            if currency:
+                return currency.round(amount)
+            return amount
+
     def get_tax_unece_code(self, tax):
         while tax:
             if tax.unece_code:

template/Factur-X-1.07.2-extended/invoice.xml

@@ -85,7 +85,7 @@ this repository contains the full copyright notices and license terms. -->
             <ram:SpecifiedLineTradeSettlement>
                 ${TradeTax(this.invoice_line_tax(line))}
                 <ram:SpecifiedTradeSettlementLineMonetarySummation>
-                    <ram:LineTotalAmount py:attrs="{'currencyID': this.invoice.currency.code}">${line.amount}</ram:LineTotalAmount>
+                    <ram:LineTotalAmount py:attrs="{'currencyID': this.invoice.currency.code}">${this.get_line_amount(line)}</ram:LineTotalAmount>
                 </ram:SpecifiedTradeSettlementLineMonetarySummation>
             </ram:SpecifiedLineTradeSettlement>
         </ram:IncludedSupplyChainTradeLineItem>

tests/test_edocument.py

@@ -7,7 +7,8 @@ from lxml import etree
 import os
 from decimal import Decimal
 from datetime import date
-from trytond.tests.test_tryton import ModuleTestCase, with_transaction
+from trytond.tests.test_tryton import (
+    ModuleTestCase, with_transaction, activate_module)
 from trytond.pool import Pool
 from trytond.modules.company.tests import create_company, set_company
 from trytond.modules.account.tests import create_chart, get_fiscalyear
@@ -42,6 +43,14 @@ class EdocTestCase(ModuleTestCase):
     'Test e-rechnung module'
     module = 'edocument_xrechnung'
 
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        activate_module([
+            'edocument_uncefact', 'party', 'bank',
+            'account_invoice', 'sale_point_invoice',
+            'product_grossprice'], 'en')
+
     def prep_fiscalyear(self, company1):
         """ prepare fiscal year, sequences...
         """
@@ -84,7 +93,7 @@ class EdocTestCase(ModuleTestCase):
                 'number': 'DE02300209000106531065'}])]}])
         return company
 
-    def prep_invoice(self, credit_note=False):
+    def prep_invoice(self, credit_note=False, modegross='net'):
         """ add invoice
         """
         pool = Pool()
@@ -130,6 +139,7 @@ class EdocTestCase(ModuleTestCase):
 
         to_create_invoice = [{
             'type': 'out',
+            'modegross': modegross,
             'description': 'description of invoice',
             'comment': 'note line 1\nnote line 2',
             'invoice_date': date(2024, 7, 1),
@@ -149,6 +159,11 @@ class EdocTestCase(ModuleTestCase):
                 'currency': currency1.id,
                 }])],
             }]
+
+        if modegross == 'gross':
+            to_create_invoice[0]['lines'][0][1][0]['unit_gross_price'] = (
+                Decimal('50.0') * Decimal('1.2'))
+
         inv_lst, = Invoice.create(to_create_invoice)
         inv_lst.on_change_lines()
         inv_lst.save()
@@ -233,6 +248,34 @@ class EdocTestCase(ModuleTestCase):
                 {'identifiers': [('delete', [party.identifiers[0].id])]}]
             )
 
+    @with_transaction()
+    def test_xrechn_export_facturx_gross(self):
+        """ run export - factur-x, modegross='gross'
+        """
+        pool = Pool()
+        Template = pool.get('edocument.facturxext.invoice')
+
+        company = self.prep_company()
+        with set_company(company):
+            create_chart(company=company, tax=True)
+            self.prep_fiscalyear(company)
+            invoice = self.prep_invoice(modegross='gross')
+
+            template = Template(invoice)
+
+            schema_file = os.path.join(
+                os.path.dirname(__file__),
+                'Factur-X_1.07.2_EXTENDED',
+                'Factur-X_1.07.2_EXTENDED.xsd')
+
+            invoice_string = template.render('Factur-X-1.07.2-extended')
+            with open('gross_invoice_string.xml', 'wb') as fhdl:
+                fhdl.write(invoice_string)
+
+            invoice_xml = etree.fromstring(invoice_string)
+            schema = etree.XMLSchema(etree.parse(schema_file))
+            schema.assertValid(invoice_xml)
+
     @with_transaction()
     def test_xrechn_export_facturx(self):
         """ run export - factur-x

tryton.cfg

@@ -5,6 +5,9 @@ depends:
     party
     bank
     account_invoice
+extras_depend:
+    sale_point_invoice
+    product_grossprice
 xml:
     message.xml
     configuration.xml