[FIX] account_edi_ubl_cii: round PriceAmount (repr. error)

We no longer round the PriceAmount since
0fd7284158483bce3308e7c5ba42e3c6ee5abd10.

But then, we may encounter a representation error if the PriceAmount is
not exactly representable as a binary fraction (see:
https://docs.python.org/3/tutorial/floatingpoint.html#representation-error).

For instance: having a line with `price_subtotal` = 306.45 and
`quantity` = 3, we will compute the PriceAmount as 306.45 / 3 which
yields 102.14999999999999.

To avoid such a case we round "reasonably" the PriceAmount.

opw-3729369

closes odoo/odoo#154361

X-original-commit: f27818e7bc62c548e9bd76d47594d3dcdec85d3d
Signed-off-by: Laurent Smet (las) <las@odoo.com>
Signed-off-by: Julien Van Roy (juvr) <juvr@odoo.com>

addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py

@@ -4,6 +4,7 @@ from lxml import etree
 
 from odoo import models, _
 from odoo.tools import html2plaintext, cleanup_xml_node
+from odoo.tools.float_utils import float_round
 
 
 class AccountEdiXmlUBL20(models.AbstractModel):
@@ -338,7 +339,7 @@ class AccountEdiXmlUBL20(models.AbstractModel):
             'currency_dp': self._get_currency_decimal_places(line.currency_id),
 
             # The price of an item, exclusive of VAT, after subtracting item price discount.
-            'price_amount': gross_price_unit,
+            'price_amount': float_round(gross_price_unit, 10),
             'product_price_dp': self.env['decimal.precision'].precision_get('Product Price'),
 
             # The number of item units to which the price applies.

addons/l10n_account_edi_ubl_cii_tests/tests/test_xml_ubl_be.py

@@ -1,9 +1,12 @@
 # -*- coding: utf-8 -*-
+import base64
+from lxml import etree
+
 from odoo import Command
 from odoo.addons.l10n_account_edi_ubl_cii_tests.tests.common import TestUBLCommon
 from odoo.addons.account.tests.test_account_move_send import TestAccountMoveSendCommon
 from odoo.tests import tagged
-import base64
+
 
 @tagged('post_install_l10n', 'post_install', '-at_install')
 class TestUBLBE(TestUBLCommon, TestAccountMoveSendCommon):
@@ -486,6 +489,21 @@ class TestUBLBE(TestUBLCommon, TestAccountMoveSendCommon):
 
         self._assert_invoice_attachment(invoice.ubl_cii_xml_id, None, 'from_odoo/bis3_export_with_changed_taxes.xml')
 
+    def test_export_rounding_price_amount(self):
+        invoice = self._generate_move(
+            self.partner_1,
+            self.partner_2,
+            move_type='out_invoice',
+            invoice_line_ids=[{
+                'product_id': self.product_a.id,
+                'quantity': 3,
+                'price_unit': 102.15,
+                'tax_ids': [Command.set([self.tax_12.id])]
+            }],
+        )
+        price_amount = etree.fromstring(invoice.ubl_cii_xml_id.raw).find('.//{*}InvoiceLine/{*}Price/{*}PriceAmount')
+        self.assertEqual(price_amount.text, '102.15')
+
     ####################################################
     # Test import
     ####################################################