diff --git a/InvenTree/order/api.py b/InvenTree/order/api.py
index 247e391767..1012fba392 100644
--- a/InvenTree/order/api.py
+++ b/InvenTree/order/api.py
@@ -798,6 +798,13 @@ class SOAdditionalLineItemList(generics.ListCreateAPIView):
     ]
 
 
+class SOAdditionalLineItemDetail(generics.RetrieveUpdateDestroyAPIView):
+    """ API endpoint for detail view of a SalesOrderAdditionalLineItem object """
+
+    queryset = models.SalesOrderAdditionalLineItem.objects.all()
+    serializer_class = serializers.SOAdditionalLineItemSerializer
+
+
 class SOLineItemDetail(generics.RetrieveUpdateDestroyAPIView):
     """ API endpoint for detail view of a SalesOrderLineItem object """
 
@@ -1116,6 +1123,12 @@ order_api_urls = [
         url(r'^$', SOLineItemList.as_view(), name='api-so-line-list'),
     ])),
 
+    # API endpoints for sales order additional line items
+    url(r'^so-additional-line/', include([
+        url(r'^(?P<pk>\d+)/$', SOAdditionalLineItemDetail.as_view(), name='api-so-additional-line-detail'),
+        url(r'^$', SOAdditionalLineItemList.as_view(), name='api-so-additional-line-list'),
+    ])),
+
     # API endpoints for sales order allocations
     url(r'^so-allocation/', include([
         url(r'^(?P<pk>\d+)/$', SOAllocationDetail.as_view(), name='api-so-allocation-detail'),
diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index 4a1147c890..2a975a432c 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -1175,6 +1175,9 @@ class SalesOrderAdditionalLineItem(OrderLineItem):
         title: titile of line item
         sale_price: The unit sale price for this OrderLineItem
     """
+    @staticmethod
+    def get_api_url():
+        return reverse('api-so-additional-line-list')
 
     order = models.ForeignKey(SalesOrder, on_delete=models.CASCADE, related_name='additional_lines', verbose_name=_('Order'), help_text=_('Sales Order'))