fix - free product transaction save

apps/warehouse/pos/api/v2/serializers.py

@@ -207,14 +207,16 @@ class InventoryQuotaSaleTransactionSerializer(serializers.ModelSerializer):
                     id=distribution_id
                 ).first() if distribution_id else None
 
-                quota_stat_id = item_data.pop('quota_stat')
-                quota_stat = OrganizationQuotaStats.objects.get(id=quota_stat_id)
+                quota_stat_id = item_data.pop('quota_stat') if 'quota_stat' in item_data.keys() else None
+                quota_stat = OrganizationQuotaStats.objects.get(
+                    id=quota_stat_id
+                ) if quota_stat_id else None
 
                 # create item for transaction
                 item = warehouse_models.InventoryQuotaSaleItem.objects.create(
                     transaction=transaction,
                     **{'quota_distribution': distribution} if distribution else {},
-                    quota_stat=quota_stat,
+                    **{'quota_stat': quota_stat, } if quota_stat else {},
                     gov_product=Product.objects.get(
                         id=gov_product
                     ) if Product.objects.filter(id=gov_product).exists() else None,