diff --git a/addons/sale_management/models/sale_order.py b/addons/sale_management/models/sale_order.py
index 4ed4ebd69d4..165d5acf59b 100644
--- a/addons/sale_management/models/sale_order.py
+++ b/addons/sale_management/models/sale_order.py
@@ -220,11 +220,19 @@ class SaleOrderOption(models.Model):
             return [('line_id', '=', False)]
         return [('line_id', '!=', False)]
 
-    @api.onchange('product_id', 'uom_id')
+    @api.onchange('product_id', 'uom_id', 'quantity')
     def _onchange_product_id(self):
         if not self.product_id:
             return
-        product = self.product_id.with_context(lang=self.order_id.partner_id.lang)
+        product = self.product_id.with_context(
+            lang=self.order_id.partner_id.lang,
+            partner=self.order_id.partner_id,
+            quantity=self.quantity,
+            date=self.order_id.date_order,
+            pricelist=self.order_id.pricelist_id.id,
+            uom=self.uom_id.id,
+            fiscal_position=self.env.context.get('fiscal_position')
+        )
         self.name = product.get_product_multiline_description_sale()
         self.uom_id = self.uom_id or product.uom_id
         # To compute the discount a so line is created in cache