diff --git a/InvenTree/InvenTree/helpers.py b/InvenTree/InvenTree/helpers.py
index 9d00697230..330bd2bb68 100644
--- a/InvenTree/InvenTree/helpers.py
+++ b/InvenTree/InvenTree/helpers.py
@@ -21,6 +21,9 @@ import InvenTree.version
 
 from common.models import InvenTreeSetting
 from .settings import MEDIA_URL, STATIC_URL
+from common.settings import currency_code_default
+
+from djmoney.money import Money
 
 
 def getSetting(key, backup_value=None):
@@ -247,6 +250,22 @@ def decimal2string(d):
     return s.rstrip("0").rstrip(".")
 
 
+def decimal2money(d, currency=None):
+    """
+    Format a Decimal number as Money
+
+    Args:
+        d: A python Decimal object
+        currency: Currency of the input amount, defaults to default currency in settings
+
+    Returns:
+        A Money object from the input(s)
+    """
+    if not currency:
+        currency = currency_code_default()
+    return Money(d, currency)
+
+
 def WrapWithQuotes(text, quote='"'):
     """ Wrap the supplied text with quotes
 
diff --git a/InvenTree/InvenTree/serializers.py b/InvenTree/InvenTree/serializers.py
index 50a37d8cba..772daa06ab 100644
--- a/InvenTree/InvenTree/serializers.py
+++ b/InvenTree/InvenTree/serializers.py
@@ -7,8 +7,6 @@ from __future__ import unicode_literals
 
 import os
 
-from collections import OrderedDict
-
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError as DjangoValidationError
@@ -46,16 +44,13 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
 
     def __init__(self, instance=None, data=empty, **kwargs):
 
-        self.instance = instance
+        # self.instance = instance
 
         # If instance is None, we are creating a new instance
-        if instance is None:
+        if instance is None and data is not empty:
             
-            if data is empty:
-                data = OrderedDict()
-            else:
-                # Required to side-step immutability of a QueryDict
-                data = data.copy()
+            # Required to side-step immutability of a QueryDict
+            data = data.copy()
 
             # Add missing fields which have default values
             ModelClass = self.Meta.model
@@ -64,6 +59,11 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
 
             for field_name, field in fields.fields.items():
 
+                """
+                Update the field IF (and ONLY IF):
+                - The field has a specified default value
+                - The field does not already have a value set
+                """
                 if field.has_default() and field_name not in data:
 
                     value = field.default
@@ -85,7 +85,7 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
         Use the 'default' values specified by the django model definition
         """
 
-        initials = super().get_initial()
+        initials = super().get_initial().copy()
 
         # Are we creating a new instance?
         if self.instance is None:
@@ -111,7 +111,8 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
         return initials
 
     def run_validation(self, data=empty):
-        """ Perform serializer validation.
+        """
+        Perform serializer validation.
         In addition to running validators on the serializer fields,
         this class ensures that the underlying model is also validated.
         """
diff --git a/InvenTree/InvenTree/test_api.py b/InvenTree/InvenTree/test_api.py
index e37984e20d..791f98025b 100644
--- a/InvenTree/InvenTree/test_api.py
+++ b/InvenTree/InvenTree/test_api.py
@@ -2,6 +2,11 @@
 
 from rest_framework import status
 
+from django.test import TestCase
+
+from django.contrib.auth import get_user_model
+from django.contrib.auth.models import Group
+
 from django.urls import reverse
 
 from InvenTree.api_tester import InvenTreeAPITestCase
@@ -11,6 +16,87 @@ from users.models import RuleSet
 from base64 import b64encode
 
 
+class HTMLAPITests(TestCase):
+    """
+    Test that we can access the REST API endpoints via the HTML interface.
+    
+    History: Discovered on 2021-06-28 a bug in InvenTreeModelSerializer,
+    which raised an AssertionError when using the HTML API interface,
+    while the regular JSON interface continued to work as expected.
+    """
+
+    def setUp(self):
+        super().setUp()
+
+        # Create a user
+        user = get_user_model()
+
+        self.user = user.objects.create_user(
+            username='username',
+            email='user@email.com',
+            password='password'
+        )
+
+        # Put the user into a group with the correct permissions
+        group = Group.objects.create(name='mygroup')
+        self.user.groups.add(group)
+
+        # Give the group *all* the permissions!
+        for rule in group.rule_sets.all():
+            rule.can_view = True
+            rule.can_change = True
+            rule.can_add = True
+            rule.can_delete = True
+
+            rule.save()
+
+        self.client.login(username='username', password='password')
+
+    def test_part_api(self):
+        url = reverse('api-part-list')
+
+        # Check JSON response
+        response = self.client.get(url, HTTP_ACCEPT='application/json')
+        self.assertEqual(response.status_code, 200)
+
+        # Check HTTP response
+        response = self.client.get(url, HTTP_ACCEPT='text/html')
+        self.assertEqual(response.status_code, 200)
+
+    def test_build_api(self):
+        url = reverse('api-build-list')
+
+        # Check JSON response
+        response = self.client.get(url, HTTP_ACCEPT='application/json')
+        self.assertEqual(response.status_code, 200)
+
+        # Check HTTP response
+        response = self.client.get(url, HTTP_ACCEPT='text/html')
+        self.assertEqual(response.status_code, 200)
+
+    def test_stock_api(self):
+        url = reverse('api-stock-list')
+
+        # Check JSON response
+        response = self.client.get(url, HTTP_ACCEPT='application/json')
+        self.assertEqual(response.status_code, 200)
+
+        # Check HTTP response
+        response = self.client.get(url, HTTP_ACCEPT='text/html')
+        self.assertEqual(response.status_code, 200)
+
+    def test_company_list(self):
+        url = reverse('api-company-list')
+
+        # Check JSON response
+        response = self.client.get(url, HTTP_ACCEPT='application/json')
+        self.assertEqual(response.status_code, 200)
+
+        # Check HTTP response
+        response = self.client.get(url, HTTP_ACCEPT='text/html')
+        self.assertEqual(response.status_code, 200)
+
+
 class APITests(InvenTreeAPITestCase):
     """ Tests for the InvenTree API """
 
diff --git a/InvenTree/InvenTree/version.py b/InvenTree/InvenTree/version.py
index 08fa5e0ae4..6afa5ebadd 100644
--- a/InvenTree/InvenTree/version.py
+++ b/InvenTree/InvenTree/version.py
@@ -8,7 +8,7 @@ import re
 
 import common.models
 
-INVENTREE_SW_VERSION = "0.2.4 pre"
+INVENTREE_SW_VERSION = "0.2.5 pre"
 
 INVENTREE_API_VERSION = 6
 
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 55ecd9d5ed..b69177c05b 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -39,7 +39,7 @@ from InvenTree import helpers
 from InvenTree import validators
 from InvenTree.models import InvenTreeTree, InvenTreeAttachment
 from InvenTree.fields import InvenTreeURLField
-from InvenTree.helpers import decimal2string, normalize
+from InvenTree.helpers import decimal2string, normalize, decimal2money
 
 from InvenTree.status_codes import BuildStatus, PurchaseOrderStatus, SalesOrderStatus
 
@@ -2451,7 +2451,7 @@ class BomItem(models.Model):
         return "{n} x {child} to make {parent}".format(
             parent=self.part.full_name,
             child=self.sub_part.full_name,
-            n=helpers.decimal2string(self.quantity))
+            n=decimal2string(self.quantity))
 
     def available_stock(self):
         """
@@ -2535,12 +2535,12 @@ class BomItem(models.Model):
         return required
 
     @property
-    def price_range(self):
+    def price_range(self, internal=False):
         """ Return the price-range for this BOM item. """
 
         # get internal price setting
         use_internal = common.models.InvenTreeSetting.get_setting('PART_BOM_USE_INTERNAL_PRICE', False)
-        prange = self.sub_part.get_price_range(self.quantity, intenal=use_internal)
+        prange = self.sub_part.get_price_range(self.quantity, internal=use_internal and internal)
 
         if prange is None:
             return prange
@@ -2548,11 +2548,11 @@ class BomItem(models.Model):
         pmin, pmax = prange
 
         if pmin == pmax:
-            return decimal2string(pmin)
+            return decimal2money(pmin)
 
         # Convert to better string representation
-        pmin = decimal2string(pmin)
-        pmax = decimal2string(pmax)
+        pmin = decimal2money(pmin)
+        pmax = decimal2money(pmax)
 
         return "{pmin} to {pmax}".format(pmin=pmin, pmax=pmax)
 
diff --git a/InvenTree/part/serializers.py b/InvenTree/part/serializers.py
index 7200309afa..ff178c5941 100644
--- a/InvenTree/part/serializers.py
+++ b/InvenTree/part/serializers.py
@@ -381,7 +381,7 @@ class PartStarSerializer(InvenTreeModelSerializer):
 class BomItemSerializer(InvenTreeModelSerializer):
     """ Serializer for BomItem object """
 
-    # price_range = serializers.CharField(read_only=True)
+    price_range = serializers.CharField(read_only=True)
 
     quantity = serializers.FloatField()
 
@@ -496,7 +496,7 @@ class BomItemSerializer(InvenTreeModelSerializer):
             'reference',
             'sub_part',
             'sub_part_detail',
-            # 'price_range',
+            'price_range',
             'validated',
         ]
 
diff --git a/InvenTree/templates/js/bom.js b/InvenTree/templates/js/bom.js
index 7328bcb331..665379d8d5 100644
--- a/InvenTree/templates/js/bom.js
+++ b/InvenTree/templates/js/bom.js
@@ -259,26 +259,19 @@ function loadBomTable(table, options) {
         sortable: true,
     });
 
-    /*
-
-    // TODO - Re-introduce the pricing column at a later stage,
-    //        once the pricing has been "fixed"
-    //        O.W. 2020-11-24
-
     cols.push(
     {
         field: 'price_range',
-        title: '{% trans "Price" %}',
+        title: '{% trans "Buy Price" %}',
         sortable: true,
         formatter: function(value, row, index, field) {
             if (value) {
                 return value;
             } else {
-                return "<span class='warning-msg'>{% trans "No pricing available" %}</span>";
+                return "<span class='warning-msg'>{% trans 'No pricing available' %}</span>";
             }
         }
     });
-    */
 
     cols.push({
         field: 'optional',
diff --git a/InvenTree/templates/js/build.js b/InvenTree/templates/js/build.js
index 3e5e438add..7b72149ec9 100644
--- a/InvenTree/templates/js/build.js
+++ b/InvenTree/templates/js/build.js
@@ -231,6 +231,7 @@ function loadBuildOrderAllocationTable(table, options={}) {
             {
                 field: 'quantity',
                 title: '{% trans "Quantity" %}',
+                sortable: true,
             }
         ]
     });
diff --git a/InvenTree/templates/js/order.js b/InvenTree/templates/js/order.js
index 649357b083..0af54fa43c 100644
--- a/InvenTree/templates/js/order.js
+++ b/InvenTree/templates/js/order.js
@@ -391,6 +391,7 @@ function loadSalesOrderAllocationTable(table, options={}) {
             {
                 field: 'quantity',
                 title: '{% trans "Quantity" %}',
+                sortable: true,
             }
         ]
     });