Use total package weight and volume as shipment weight for PDP

The shipment weight must not be less than the sum of parcel weights.

Closes #15121

modules/stock_package_shipping_dpd/stock.py

@@ -284,10 +284,18 @@ class CreateDPDShipping(Wizard):
         cm3 = UoM(ModelData.get_id('product', 'uom_cubic_centimeter'))
         kg = UoM(ModelData.get_id('product', 'uom_kilogram'))
 
+        volume = sum(
+            UoM.compute_qty(
+                p.volume_uom, p.total_volume, shipment.volume_uom, round=False)
+            for p in shipment.root_packages)
         volume = round(UoM.compute_qty(
-                shipment.volume_uom, shipment.volume, cm3, round=False))
+                shipment.volume_uom, volume, cm3, round=False))
+        weight = sum(
+            UoM.compute_qty(
+                p.weight_uom, p.total_weight, shipment.weight_uom, round=False)
+            for p in shipment.root_packages)
         weight = round(UoM.compute_qty(
-                shipment.weight_uom, shipment.weight, kg, round=False), 2)
+                shipment.weight_uom, weight, kg, round=False), 2)
         return {
             'generalShipmentData': {
                 'identificationNumber': shipment.number,

modules/stock_package_shipping_dpd/tests/scenario_shipping_dpd.rst

@@ -136,7 +136,9 @@ Create Package Type::
     ...     name='Box',
     ...     length=10, length_uom=cm,
     ...     height=8, height_uom=cm,
-    ...     width=5, width_uom=cm)
+    ...     width=5, width_uom=cm,
+    ...     packaging_weight=50,
+    ...     packaging_weight_uom=g)
     >>> box.save()
 
 Create a DPD Carrier and the related credential::