Fee FI bug

modules/purchase_trade/fee.py

@@ -317,14 +317,26 @@ class Fee(ModelSQL,ModelView):
         if self.product:
             return self.product.template.landed_cost
     
-    def get_quantity(self,name=None):
-        qt = self.get_fee_lots_qt()
-        if qt:
-            return qt
-        LotQt = Pool().get('lot.qt')
-        lqts = LotQt.search(['lot_shipment_in','=',self.shipment_in.id])
-        if lqts:
-            return Decimal(lqts[0].lot_quantity)
+    def get_quantity(self,name=None):
+        qt = self.get_fee_lots_qt()
+        if qt:
+            return qt
+        line = self.line or self.sale_line
+        if line and line.lots:
+            return sum(
+                Decimal(lot.get_current_quantity_converted(0, self.unit))
+                for lot in line.lots)
+        LotQt = Pool().get('lot.qt')
+        if self.shipment_in:
+            lqts = LotQt.search(['lot_shipment_in','=',self.shipment_in.id])
+            if lqts:
+                return Decimal(lqts[0].lot_quantity)
+
+    def _get_amount_quantity(self):
+        quantity = self.quantity
+        if quantity is None:
+            quantity = self.get_quantity()
+        return Decimal(quantity or 0)
 
     def get_amount(self,name=None):
         Date = Pool().get('ir.date')
@@ -358,7 +370,7 @@ class Fee(ModelSQL,ModelView):
                                     compounding='simple'
                                 )
 
-                                return round(factor * self.line.unit_price * (self.quantity if self.quantity else 0) * sign,2)
+                                return round(factor * self.line.unit_price * self._get_amount_quantity() * sign,2)
                 if self.sale_line:
                     if self.sale_line.sale.payment_term:
                         beg_date = self.fee_date if self.fee_date else Date.today()
@@ -374,7 +386,7 @@ class Fee(ModelSQL,ModelView):
                                 compounding='simple'
                             )
                             logger.info("FACTOR:%s",factor)
-                            return round(factor * self.sale_line.unit_price * (self.quantity if self.quantity else 0) * sign,2)
+                            return round(factor * self.sale_line.unit_price * self._get_amount_quantity() * sign,2)
 
             elif self.mode == 'perqt':
                 if self.shipment_in:

modules/purchase_trade/tests/test_module.py

@@ -224,6 +224,37 @@ class PurchaseTradeTestCase(ModuleTestCase):
 
         self.assertEqual(values[0]['amount'], Decimal('0'))
 
+    def test_purchase_rate_fee_amount_uses_virtual_lot_quantity(self):
+        'purchase rate fee amount falls back to the purchase virtual lot quantity'
+        Fee = Pool().get('fee.fee')
+        fee = Fee()
+        fee.mode = 'rate'
+        fee.price = Decimal('12')
+        fee.fee_date = datetime.date(2026, 4, 23)
+        fee.quantity = None
+        fee.unit = Mock()
+        fee.shipment_in = None
+        lot = Mock()
+        lot.get_current_quantity_converted.return_value = Decimal('10')
+        fee.line = Mock(
+            unit_price=Decimal('100'),
+            lots=[lot],
+            estimated_date=[
+                Mock(
+                    trigger='bldate',
+                    estimated_date=datetime.date(2026, 5, 23),
+                    fin_int_delta=10,
+                ),
+            ],
+        )
+        fee.sale_line = None
+
+        with patch('trytond.modules.purchase_trade.fee.Pool') as PoolMock:
+            PoolMock.return_value.get.return_value = Mock(
+                today=Mock(return_value=datetime.date(2026, 4, 23)))
+
+            self.assertEqual(fee.get_amount(), Decimal('13.33'))
+
     def test_create_pnl_price_from_line_ignores_finished_matched_sale_line(self):
         'purchase valuation does not add sale-side pnl when the matched sale line is finished'
         Valuation = Pool().get('valuation.valuation')