diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index fe336e2aba..884adefe2f 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -223,7 +223,7 @@ class PurchaseOrder(Order):
         return reverse('po-detail', kwargs={'pk': self.id})
 
     @transaction.atomic
-    def add_line_item(self, supplier_part, quantity, group=True, reference=''):
+    def add_line_item(self, supplier_part, quantity, group=True, reference='', purchase_price=None):
         """ Add a new line item to this purchase order.
         This function will check that:
 
@@ -254,7 +254,11 @@ class PurchaseOrder(Order):
             if matches.count() > 0:
                 line = matches.first()
 
-                line.quantity += quantity
+                # update quantity and price
+                quantity_new = line.quantity + quantity
+                line.quantity = quantity_new
+                if purchase_price:
+                    line.purchase_price = supplier_part.get_price(quantity_new) / quantity_new
                 line.save()
 
                 return
@@ -263,7 +267,9 @@ class PurchaseOrder(Order):
             order=self,
             part=supplier_part,
             quantity=quantity,
-            reference=reference)
+            reference=reference,
+            purchase_price=purchase_price,
+        )
 
         line.save()
 
diff --git a/InvenTree/order/views.py b/InvenTree/order/views.py
index f9ec52254f..fc7f376206 100644
--- a/InvenTree/order/views.py
+++ b/InvenTree/order/views.py
@@ -996,6 +996,7 @@ class OrderParts(AjaxView):
 
                 part.order_supplier = supplier_part.id if supplier_part else None
                 part.order_quantity = quantity
+                part.purchase_price = supplier_part.get_price(quantity) / quantity if supplier_part else None
 
                 self.parts.append(part)
 
@@ -1096,7 +1097,10 @@ class OrderParts(AjaxView):
                         sp=item.order_supplier))
                     continue
 
-                order.add_line_item(supplier_part, quantity)
+                # get purchase price
+                purchase_price = item.purchase_price if item.purchase_price else None
+
+                order.add_line_item(supplier_part, quantity, purchase_price=purchase_price)
 
 
 class POLineItemCreate(AjaxCreateView):