Correctly convert unit price to set as cost price

The unit price of the supplier move is in the currency of the purchase when
the cost price must be in the company currency.

issue7243
review44901002

purchase.py

@@ -1,5 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
+from decimal import Decimal
+
 from trytond import backend
 from trytond.model import ModelSQL, ValueMixin, fields
 from trytond.pyson import Eval
@@ -187,9 +189,15 @@ class PurchaseLine:
         return result
 
     def get_move(self, move_type):
+        pool = Pool()
+        Currency = pool.get('currency.currency')
         move = super(PurchaseLine, self).get_move(move_type)
         if move and self.purchase.customer:
-            move.cost_price = move.unit_price
+            digits = move.__class__.cost_price.digits
+            cost_price = Currency.compute(
+                move.currency, move.unit_price, move.company.currency)
+            move.cost_price = cost_price.quantize(
+                Decimal(str(10.0 ** -digits[1])))
         return move
 
 

tests/scenario_sale_supply_drop_shipment.rst

@@ -180,6 +180,8 @@ Receiving only 100 products::
     >>> move.quantity = 100
     >>> move.unit_price
     Decimal('3.0000')
+    >>> move.cost_price
+    Decimal('3.0000')
     >>> shipment.click('ship')
     >>> move, = shipment.customer_moves
     >>> move.unit_price