diff --git a/InvenTree/build/templates/build/build_output.html b/InvenTree/build/templates/build/build_output.html
index f35672bf79..e5a3e77e61 100644
--- a/InvenTree/build/templates/build/build_output.html
+++ b/InvenTree/build/templates/build/build_output.html
@@ -9,7 +9,7 @@
 <h4>{% trans "Build Outputs" %}</h4>
 <hr>
 
-{% include "stock_table.html" %}
+{% include "stock_table.html" with read_only=True %}
 
 {% endblock %}
 
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 59bcbe57b1..f305b51c4c 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -27,6 +27,7 @@ from django_cleanup import cleanup
 
 from mptt.models import TreeForeignKey
 
+from decimal import Decimal
 from datetime import datetime
 from fuzzywuzzy import fuzz
 import hashlib
@@ -1208,6 +1209,9 @@ class BomItem(models.Model):
                 if percent < 0:
                     percent = 0
 
+                # Must be represented as a decimal
+                percent = Decimal(percent)
+
                 return int(percent * quantity)
 
             except ValueError:
diff --git a/InvenTree/part/test_bom_item.py b/InvenTree/part/test_bom_item.py
index e5d94744c0..95e1dbb2c7 100644
--- a/InvenTree/part/test_bom_item.py
+++ b/InvenTree/part/test_bom_item.py
@@ -43,3 +43,55 @@ class BomItemTest(TestCase):
             # A validation error should be raised here
             item = BomItem.objects.create(part=self.bob, sub_part=self.bob, quantity=7)
             item.clean()
+
+    def test_overage(self):
+        """ Test that BOM line overages are calculated correctly """
+
+        item = BomItem.objects.get(part=100, sub_part=50)
+        
+        q = 300
+
+        item.quantity = q
+
+        # Test empty overage
+        n = item.get_overage_quantity(q)
+        self.assertEqual(n, 0)
+
+        # Test improper overage
+        item.overage = 'asf234?'
+        n = item.get_overage_quantity(q)
+        self.assertEqual(n, 0)
+        
+        # Test absolute overage
+        item.overage = '3'
+        n = item.get_overage_quantity(q)
+        self.assertEqual(n, 3)
+
+        # Test percentage-based overage
+        item.overage = '5.0 % '
+        n = item.get_overage_quantity(q)
+        self.assertEqual(n, 15)
+
+        # Calculate total required quantity
+        # Quantity = 300 (+ 5%)
+        # Get quantity required to build B = 10
+        # Q * B = 3000 + 5% = 3150
+        n = item.get_required_quantity(10)
+
+        self.assertEqual(n, 3150)
+
+    def test_item_hash(self):
+        """ Test BOM item hash encoding """
+
+        item = BomItem.objects.get(part=100, sub_part=50)
+        
+        h1 = item.get_item_hash()
+
+        # Change data - the hash must change
+        item.quantity += 1
+
+        h2 = item.get_item_hash()
+
+        item.validate_hash()
+
+        self.assertNotEqual(h1, h2)
diff --git a/InvenTree/templates/stock_table.html b/InvenTree/templates/stock_table.html
index 31eaf30bb7..2d823c9510 100644
--- a/InvenTree/templates/stock_table.html
+++ b/InvenTree/templates/stock_table.html
@@ -3,6 +3,8 @@
 <div id='button-toolbar'>
     <div class='button-toolbar container-fluid' style='float: right;'>
         <button class='btn btn-default' id='stock-export' title='Export Stock Information'>{% trans "Export" %}</button>
+        {% if read_only %}
+        {% else %}
         <button class="btn btn-success" id='item-create'>{% trans "New Stock Item" %}</button>
         <div class="dropdown" style='float: right;'>
             <button id='stock-options' class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">{% trans "Options" %}<span class="caret"></span></button>
@@ -15,6 +17,7 @@
                 <li><a href='#' id='multi-item-delete' title='Delete selected items'>{% trans "Delete Stock" %}</a></li>
             </ul>
         </div>
+        {% endif %}
     </div>
 </div>