Require unit price for move between warehouses

The continental accounting requires a cost for such moves.

issue11654
review419681003
(grafted from fde807953ae4ed854d7c479a86a3230aa50d98ce)

--HG--
branch : 6.0

stock.py

@@ -70,6 +70,15 @@ class Move(metaclass=PoolMeta):
     def cost_warehouse(self):
         return self.from_cost_warehouse or self.to_cost_warehouse
 
+    @fields.depends('company', 'from_location', 'to_location')
+    def on_change_with_unit_price_required(self, name=None):
+        required = super().on_change_with_unit_price_required(name=name)
+        if (self.company and self.company.cost_price_warehouse
+                and self.from_location and self.to_location
+                and self.from_warehouse != self.to_warehouse):
+            required = True
+        return required
+
     @fields.depends('company', 'from_location', 'to_location')
     def on_change_with_cost_price_required(self, name=None):
         required = super().on_change_with_cost_price_required(name=name)

tests/scenario_account_stock_continental.rst

@@ -113,6 +113,7 @@ Transfer 1 product between warehouses::
     >>> move.to_location = shipment.to_location
     >>> move.product = product
     >>> move.quantity = 1
+    >>> move.unit_price = product.cost_price
     >>> shipment.click('wait')
     >>> shipment.click('assign_force')
 

tests/scenario_product_cost_warehouse.rst

@@ -139,6 +139,7 @@ Forbid direct move between warehouses::
     >>> move.quantity = 1
     >>> move.from_location = warehouse1.storage_location
     >>> move.to_location = warehouse2.storage_location
+    >>> move.unit_price = product.cost_price
     >>> move.save()
     >>> move.click('do')  # doctest: +IGNORE_EXCEPTION_DETAIL
     Traceback (most recent call last):
@@ -161,6 +162,7 @@ Transfer 1 product between warehouses::
     >>> move.to_location = shipment.to_location
     >>> move.product = product
     >>> move.quantity = 1
+    >>> move.unit_price = product.cost_price
     >>> shipment.click('wait')
     >>> shipment.state
     'waiting'