trade: support "Asset Price" valuation method in stock report

This shows the asset price from `stock.total_price` which can be just the
movement prices or the evaluated prices if getDestinationAssetPrice and/or
getSourceAssetPrice type based methods are defined.

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_viewStockReportBySiteDialog/your_inventory_valuation_method.xml

@@ -249,6 +249,10 @@
                           <string>Default Sales Price</string>
                           <string>default_sale_price</string>
                         </tuple>
+                        <tuple>
+                          <string>Asset Price</string>
+                          <string>asset_price</string>
+                        </tuple>
                       </list>
                     </value>
                 </item>

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/InventoryListBrain_getInventoryValuatedTotalPrice.py

@@ -39,6 +39,9 @@ def getPriceFromDefaultSupplyLine(brain, supply_line_id):
     return None
   return brain.inventory * base_price
 
+if inventory_valuation_method == 'asset_price':
+  return context.total_price
+
 if inventory_valuation_method:
   supply_line_id_mapping = {
       'default_purchase_price': 'default_psl',

bt5/erp5_trade/TestTemplateItem/portal_components/test.erp5.testTradeReports.py

@@ -1651,6 +1651,35 @@ class TestTradeReports(ERP5ReportTestCase):
         total_price=7,
     )
 
+  def testStockReport_valuation_method_asset_price(self):
+    self._createConfirmedSalePackingListForStockReportTest()
+    request = self.portal.REQUEST
+    request.form['at_date'] = DateTime(2007, 3, 3)
+    request.form['node_category'] = 'site/demo_site_A'
+    request.form['simulation_period'] = 'future'
+    request.form['inventory_valuation_method'] = 'asset_price'
+
+    line_list = self.portal.inventory_module.Base_viewStockReportBySite.listbox.\
+        get_value('default',
+                  render_format='list', REQUEST=self.portal.REQUEST)
+
+    data_line_list = [l for l in line_list if l.isDataLine()]
+    self.assertEqual(1, len(data_line_list))
+    data_line = data_line_list[0]
+    self.assertEqual(
+        data_line.column_id_list,
+        ['resource_title', 'resource_reference', 'variation_category_item_list', 'inventory', 'quantity_unit', 'total_price'])
+
+    self.checkLineProperties(
+        data_line_list[0],
+        resource_title='product_A',
+        resource_reference='ref 2',
+        variation_category_item_list=[],
+        inventory=1,
+        quantity_unit='G',
+        total_price=10,
+    )
+
   def testStockReport_valuation_and_quantity_unit_conversion(self):
     self._createConfirmedSalePackingListForStockReportTest(
         quantity=0.5,