use mixin on all serializers whos models use ReferenceIndexingMixin

InvenTree/order/serializers.py

@@ -24,6 +24,7 @@ from InvenTree.serializers import InvenTreeAttachmentSerializer
 from InvenTree.serializers import InvenTreeModelSerializer
 from InvenTree.serializers import InvenTreeDecimalField
 from InvenTree.serializers import InvenTreeMoneySerializer
+from InvenTree.serializers import ReferenceIndexingSerializerMixin
 from InvenTree.status_codes import StockStatus
 
 from part.serializers import PartBriefSerializer
@@ -39,7 +40,7 @@ from .models import SalesOrderAllocation
 from users.serializers import OwnerSerializer
 
 
-class POSerializer(InvenTreeModelSerializer):
+class POSerializer(ReferenceIndexingSerializerMixin, InvenTreeModelSerializer):
     """ Serializer for a PurchaseOrder object """
 
     def __init__(self, *args, **kwargs):
@@ -394,7 +395,7 @@ class POAttachmentSerializer(InvenTreeAttachmentSerializer):
         ]
 
 
-class SalesOrderSerializer(InvenTreeModelSerializer):
+class SalesOrderSerializer(ReferenceIndexingSerializerMixin, InvenTreeModelSerializer):
     """
     Serializers for the SalesOrder object
     """