[FIX] sale_margin: Cost price in a SO line

The margin in a SO line is the difference between the price unit and
the cost price of this SO line. In function "_product_margin" in model
"sale.order.line", the cost price is equal to the purchase_price or
the standard_price of the product. Then the cost price in the SO line
must be set with the same value when creating SO line linked to the delivery.

opw:668090

addons/delivery/sale.py

@@ -94,6 +94,11 @@ class sale_order(osv.Model):
                 'tax_id': [(6, 0, taxes_ids)],
                 'is_delivery': True,
             }
+            res = line_obj.product_id_change(cr, uid, ids, order.pricelist_id.id, values['product_id'],
+                                             qty=values['product_uom_qty'], uom=False, qty_uos=0, uos=False, name='', partner_id=order.partner_id.id,
+                                             lang=False, update_tax=True, date_order=False, packaging=False, fiscal_position=False, flag=False, context=None)
+            if res['value'].get('purchase_price'):
+                values['purchase_price'] = res['value'].get('purchase_price')
             if order.order_line:
                 values['sequence'] = order.order_line[-1].sequence + 1
             line_id = line_obj.create(cr, uid, values, context=context)

addons/sale_margin/sale_margin.py

@@ -87,7 +87,7 @@ class sale_order(osv.osv):
 
     _columns = {
         'margin': fields.function(_product_margin, string='Margin', help="It gives profitability by calculating the difference between the Unit Price and the cost price.", store={
-                'sale.order.line': (_get_order, ['margin', 'purchase_price'], 20),
+                'sale.order.line': (_get_order, ['margin', 'purchase_price', 'order_id'], 20),
                 'sale.order': (lambda self, cr, uid, ids, c={}: ids, ['order_line'], 20),
                 }, digits_compute= dp.get_precision('Product Price')),
     }