From d8012bd2dabbf01e00a0fc5fcdc7e48b2010aa85 Mon Sep 17 00:00:00 2001
From: laurentbarontini <l.barontini@open-squared.ch>
Date: Wed, 17 Jun 2026 09:32:20 +0200
Subject: [PATCH] CN/DN

---
 modules/purchase_trade/invoice.py           | 51 +++++++++++++++++++++
 modules/purchase_trade/tests/test_module.py | 12 +++--
 2 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/modules/purchase_trade/invoice.py b/modules/purchase_trade/invoice.py
index 76db961..eb71bab 100644
--- a/modules/purchase_trade/invoice.py
+++ b/modules/purchase_trade/invoice.py
@@ -923,6 +923,48 @@ class Invoice(metaclass=PoolMeta):
                 total += current_gross - previous_gross
         return total
 
+    def _get_report_weight_adjustment_totals(self):
+        reused_lots = self._get_report_reused_lot_lines()
+        if not reused_lots:
+            return None
+
+        invoice_total = Decimal(0)
+        landed_total = Decimal(0)
+        matched = False
+        for data in reused_lots.values():
+            lot = data['lot']
+            lines = data['lines']
+            negative_lines = [
+                line for line in lines
+                if Decimal(str(getattr(line, 'quantity', 0) or 0)) < 0
+            ]
+            positive_lines = [
+                line for line in lines
+                if Decimal(str(getattr(line, 'quantity', 0) or 0)) > 0
+            ]
+            if not negative_lines or not positive_lines:
+                continue
+
+            invoice_total += sum(
+                abs(self._get_report_invoice_line_weights(line)[0])
+                for line in negative_lines)
+            current_net, _ = self._get_report_lot_hist_weights(lot)
+            if current_net is None:
+                landed_total += sum(
+                    abs(self._get_report_invoice_line_weights(line)[0])
+                    for line in positive_lines)
+            else:
+                landed_total += current_net
+            matched = True
+
+        if not matched:
+            return None
+        return {
+            'invoice': invoice_total,
+            'landed': landed_total,
+            'difference': abs(landed_total - invoice_total),
+        }
+
     @staticmethod
     def _get_report_invoice_line_unit(line):
         snapshots = Invoice._get_report_invoice_line_weight_snapshots(line)
@@ -1736,6 +1778,9 @@ class Invoice(metaclass=PoolMeta):
     @property
     def report_gross(self):
         if self.lines:
+            adjustment = self._get_report_weight_adjustment_totals()
+            if adjustment:
+                return adjustment['landed']
             reused_gross = self._get_report_reused_lot_gross_total()
             if reused_gross is not None:
                 non_reused_total = sum(
@@ -1757,6 +1802,9 @@ class Invoice(metaclass=PoolMeta):
     @property
     def report_net(self):
         if self.lines:
+            adjustment = self._get_report_weight_adjustment_totals()
+            if adjustment:
+                return adjustment['invoice']
             return sum(
                 self._get_report_invoice_line_weights(line)[0]
                 for line in self._get_report_invoice_lines())
@@ -1790,6 +1838,9 @@ class Invoice(metaclass=PoolMeta):
 
     @property
     def report_weight_difference(self):
+        adjustment = self._get_report_weight_adjustment_totals()
+        if adjustment:
+            return adjustment['difference']
         gross = self.report_gross
         net = self.report_net
         if gross == '' or net == '':
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 4e1107b..35d3f78 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -6779,8 +6779,8 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(invoice.report_net, Decimal('800'))
         self.assertEqual(invoice.report_gross, Decimal('820'))
 
-    def test_invoice_report_uses_line_quantities_when_same_lot_is_invoiced_twice(self):
-        'invoice final note keeps line differences when two lines share the same lot'
+    def test_invoice_report_shows_old_current_and_difference_for_same_lot_note(self):
+        'final note weight adjustment shows old, current and difference weights'
         Invoice = Pool().get('account.invoice')
 
         mt = Mock(id=1, rec_name='MT')
@@ -6843,8 +6843,12 @@ class PurchaseTradeTestCase(ModuleTestCase):
         with patch('trytond.modules.purchase_trade.invoice.Pool') as PoolMock:
             PoolMock.return_value.get.return_value = uom_model
 
-            self.assertEqual(invoice.report_net, Decimal('-5.000'))
-            self.assertEqual(invoice.report_gross, Decimal('-6'))
+            self.assertEqual(invoice.report_net, Decimal('999995.0'))
+            self.assertEqual(invoice.report_gross, Decimal('999990'))
+            self.assertEqual(invoice.report_weight_difference, Decimal('5.0'))
+            self.assertEqual(invoice.report_net_display, '999995.00')
+            self.assertEqual(invoice.report_gross_display, '999990.00')
+            self.assertEqual(invoice.report_weight_difference_display, '5.00')
             self.assertEqual(
                 invoice.report_quantity_lines.splitlines(),
                 [