diff --git a/InvenTree/InvenTree/static/css/inventree.css b/InvenTree/InvenTree/static/css/inventree.css
index 550884608f..a1968c317e 100644
--- a/InvenTree/InvenTree/static/css/inventree.css
+++ b/InvenTree/InvenTree/static/css/inventree.css
@@ -47,7 +47,7 @@
     width: 100%;
     left: 0px;
     font-weight: bold;
-    font-size: 120%;
+    font-size: 110%;
 }
 
 .progress-bar-inner {
diff --git a/InvenTree/InvenTree/static/script/inventree/inventree.js b/InvenTree/InvenTree/static/script/inventree/inventree.js
index 04539c6d96..1e060cd6d3 100644
--- a/InvenTree/InvenTree/static/script/inventree/inventree.js
+++ b/InvenTree/InvenTree/static/script/inventree/inventree.js
@@ -78,6 +78,33 @@ function getImageUrlFromTransfer(transfer) {
     return url;
 }
 
+function makeProgressBar(value, maximum, opts) {
+    /*
+     * Render a progessbar!
+     * 
+     * @param value is the current value of the progress bar
+     * @param maximum is the maximum value of the progress bar
+     */
+
+    var options = opts || {};
+
+    value = parseFloat(value);
+    maximum = parseFloat(maximum);
+
+    var percent = parseInt(value / maximum * 100);
+
+    if (percent > 100) {
+        percent = 100;
+    }
+
+    return `
+        <div class='progress-bar'>
+            <div class='progress-bar progress-bar-inner' style='width: ${percent}%;'></div>
+            <div class='progress-bar-value'>${value} / ${maximum}</div>
+        </div>
+    `;
+}
+
 
 function enableDragAndDrop(element, url, options) {
     /* Enable drag-and-drop file uploading for a given element.
diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index 9c6d5dcbb8..ba8e6b0337 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -19,9 +19,7 @@ import os
 from datetime import datetime
 from decimal import Decimal
 
-from stock.models import StockItem
 from company.models import Company, SupplierPart
-from part.models import Part
 
 from InvenTree.fields import RoundingDecimalField
 from InvenTree.helpers import decimal2string
@@ -372,7 +370,7 @@ class SalesOrderLineItem(OrderLineItem):
 
     order = models.ForeignKey(SalesOrder, on_delete=models.CASCADE, related_name='lines', help_text=_('Sales Order'))
 
-    part = models.ForeignKey(Part, on_delete=models.SET_NULL, related_name='sales_order_line_items', null=True, help_text=_('Part'), limit_choices_to={'salable': True})
+    part = models.ForeignKey('part.Part', on_delete=models.SET_NULL, related_name='sales_order_line_items', null=True, help_text=_('Part'), limit_choices_to={'salable': True})
 
     def allocated_quantity(self):
         """ Return the total stock quantity allocated to this LineItem.
@@ -380,6 +378,6 @@ class SalesOrderLineItem(OrderLineItem):
         This is a summation of the quantity of each attached StockItem
         """
 
-        query = self.stock_items.aggregate(allocated=Coalesce(Sum('stock_item__quantity'), Decimal(0)))
+        query = self.stock_items.aggregate(allocated=Coalesce(Sum('quantity'), Decimal(0)))
 
         return query['allocated']
diff --git a/InvenTree/order/templates/order/sales_order_detail.html b/InvenTree/order/templates/order/sales_order_detail.html
index 64b75358da..59ac73cd0a 100644
--- a/InvenTree/order/templates/order/sales_order_detail.html
+++ b/InvenTree/order/templates/order/sales_order_detail.html
@@ -72,12 +72,7 @@ $("#so-lines-table").inventreeTable({
             field: 'quantity',
             title: 'Quantity',
             formatter: function(value, row, index, field) {
-                return `
-                <div class='progress-bar'>
-                    <div class='progress-bar progress-bar-inner' style='width: 50%;'></div>
-                    <div class='progress-bar-value'>${row.allocated} / ${row.quantity}</div>
-                </div>
-                `;
+                return makeProgressBar(row.allocated, row.quantity);
             }
         },
         {
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index f009f09791..1129a3ce79 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -29,6 +29,7 @@ from InvenTree.models import InvenTreeTree
 from InvenTree.fields import InvenTreeURLField
 
 from part.models import Part
+from order.models import PurchaseOrder, SalesOrderLineItem
 
 
 class StockLocation(InvenTreeTree):
@@ -262,6 +263,20 @@ class StockItem(MPTTModel):
             # TODO - Find a test than can be perfomed...
             pass
 
+        try:
+            # If this StockItem is assigned to a SalesOrderLineItem,
+            # the "Part" that the line item references is the same as the part that THIS references
+            if self.sales_order is not None:
+
+                if self.sales_order.part == None:
+                    raise ValidationError({'sales_order': _('Stock item cannot be assigned to a LineItem which does not reference a part')})
+                
+                if not self.sales_order.part == self.part:
+                    raise ValidationError({'sales_order': _('Stock item does not reference the same part object as the LineItem')})
+
+        except SalesOrderLineItem.DoesNotExist:
+            pass
+
         if self.belongs_to and self.belongs_to.pk == self.pk:
             raise ValidationError({
                 'belongs_to': _('Item cannot belong to itself')
@@ -347,7 +362,7 @@ class StockItem(MPTTModel):
     )
 
     purchase_order = models.ForeignKey(
-        'order.PurchaseOrder',
+        PurchaseOrder,
         on_delete=models.SET_NULL,
         related_name='stock_items',
         blank=True, null=True,
@@ -355,7 +370,7 @@ class StockItem(MPTTModel):
     )
 
     sales_order = models.ForeignKey(
-        'order.SalesOrderLineItem',
+        SalesOrderLineItem,
         on_delete=models.SET_NULL,
         related_name='stock_items',
         null=True)