Add constraint delete matched contracts

modules/purchase_trade/purchase.py

@@ -366,12 +366,31 @@ class Purchase(metaclass=PoolMeta):
     def default_tol_min(cls):
         return 0
     
-    @classmethod
-    def default_tol_max(cls):
-        return 0
-
-    @property
-    def report_terms(self):
+    @classmethod
+    def default_tol_max(cls):
+        return 0
+
+    @staticmethod
+    def _has_matched_physical_lots(purchase):
+        for line in purchase.lines or []:
+            for lot in line.lots or []:
+                if (
+                        getattr(lot, 'lot_type', None) == 'physic'
+                        and getattr(lot, 'line', None)
+                        and getattr(lot, 'sale_line', None)):
+                    return True
+        return False
+
+    @classmethod
+    def delete(cls, purchases):
+        for purchase in purchases:
+            if cls._has_matched_physical_lots(purchase):
+                raise UserError(
+                    "You cannot delete a purchase matched to a sale")
+        super().delete(purchases)
+
+    @property
+    def report_terms(self):
         if self.lines:
             return self.lines[0].note
         else:

modules/purchase_trade/sale.py

@@ -334,6 +334,25 @@ class Sale(metaclass=PoolMeta):
     def default_tol_max(cls):
         return 0
 
+    @staticmethod
+    def _has_matched_physical_lots(sale):
+        for line in sale.lines or []:
+            for lot in line.lots or []:
+                if (
+                        getattr(lot, 'lot_type', None) == 'physic'
+                        and getattr(lot, 'line', None)
+                        and getattr(lot, 'sale_line', None)):
+                    return True
+        return False
+
+    @classmethod
+    def delete(cls, sales):
+        for sale in sales:
+            if cls._has_matched_physical_lots(sale):
+                raise UserError(
+                    "You cannot delete a sale matched to a purchase")
+        super().delete(sales)
+
     def _get_report_lines(self):
         return [line for line in self.lines if getattr(line, 'type', None) == 'line']
 

modules/purchase_trade/tests/test_module.py

@@ -185,6 +185,42 @@ class PurchaseTradeTestCase(ModuleTestCase):
             self.assertEqual(
                 PurchaseLine.default_pricing_rule(), 'Default pricing rule')
 
+    def test_purchase_delete_blocks_matched_physical_contract(self):
+        'purchase delete stops when a physical lot already links purchase and sale'
+        Purchase = Pool().get('purchase.purchase')
+        matched_lot = Mock(lot_type='physic', line=Mock(), sale_line=Mock())
+        purchase = Mock(lines=[Mock(lots=[matched_lot])])
+
+        with self.assertRaises(UserError):
+            Purchase.delete([purchase])
+
+    def test_purchase_delete_delegates_when_no_matched_physical_lot(self):
+        'purchase delete keeps default flow when no matched physical lot exists'
+        Purchase = Pool().get('purchase.purchase')
+        purchase = Mock(lines=[Mock(lots=[Mock(lot_type='virtual')])])
+
+        with patch('trytond.modules.purchase_trade.purchase.super') as super_mock:
+            Purchase.delete([purchase])
+            super_mock.return_value.delete.assert_called_once_with([purchase])
+
+    def test_sale_delete_blocks_matched_physical_contract(self):
+        'sale delete stops when a physical lot already links sale and purchase'
+        Sale = Pool().get('sale.sale')
+        matched_lot = Mock(lot_type='physic', line=Mock(), sale_line=Mock())
+        sale = Mock(lines=[Mock(lots=[matched_lot])])
+
+        with self.assertRaises(UserError):
+            Sale.delete([sale])
+
+    def test_sale_delete_delegates_when_no_matched_physical_lot(self):
+        'sale delete keeps default flow when no matched physical lot exists'
+        Sale = Pool().get('sale.sale')
+        sale = Mock(lines=[Mock(lots=[Mock(lot_type='virtual')])])
+
+        with patch('trytond.modules.purchase_trade.sale.super') as super_mock:
+            Sale.delete([sale])
+            super_mock.return_value.delete.assert_called_once_with([sale])
+
     def test_component_quota_uses_quantity_fallback_when_theoretical_is_missing(self):
         'component quota does not crash when theoretical quantity is still empty'
         SaleComponent = Pool().get('pricing.component')