diff --git a/apps/warehouse/web/api/v1/serializers.py b/apps/warehouse/web/api/v1/serializers.py
index fd05970..e3318d1 100644
--- a/apps/warehouse/web/api/v1/serializers.py
+++ b/apps/warehouse/web/api/v1/serializers.py
@@ -112,7 +112,7 @@ class InventoryQuotaSaleTransactionSerializer(serializers.ModelSerializer):
 
         return attrs
 
-    def to_representation(self, instance):
+    def to_representation(self, instance: warehouse_models.InventoryQuotaSaleTransaction):
         """ custom output of inventory sale transaction serializer """
 
         representation = super().to_representation(instance)
@@ -140,3 +140,11 @@ class InventoryQuotaSaleItemSerializer(serializers.ModelSerializer):
     class Meta:
         model = warehouse_models.InventoryQuotaSaleItem
         fields = '__all__'
+
+    def to_representation(self, instance):
+        representation = super().to_representation(instance)
+
+        if instance.quota_stat:
+            representation['quota_sale_unit'] = instance.quota_stat.quota.sale_unit.unit
+
+        return representation