diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index 2dd0a5e54f..4efa76449f 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -158,8 +158,10 @@ class Order(ReferenceIndexingMixin):
         target_currency = currency_code_default()
         total = Money(0, target_currency)
 
+        # gather name reference
+        price_ref = 'sale_price' if isinstance(self, SalesOrder) else 'purchase_price'
         # order items
-        total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.lines.all() if a.sale_price])
+        total += sum([a.quantity * convert_money(getattr(a, price_ref), target_currency) for a in self.lines.all() if hasattr(a, price_ref)])
 
         # additional lines
         total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.additional_lines.all() if a.sale_price])