diff --git a/app/serializers/api/order_serializer.rb b/app/serializers/api/order_serializer.rb
index f5e9b001d8..dcd38aa651 100644
--- a/app/serializers/api/order_serializer.rb
+++ b/app/serializers/api/order_serializer.rb
@@ -11,7 +11,7 @@ module Api
       if OpenFoodNetwork::FeatureToggle.enabled?(:customer_balance, object.user)
         -object.balance_value
       else
-        object.outstanding_balance
+        object.old_outstanding_balance
       end
     end
 
diff --git a/engines/order_management/app/services/order_management/reports/bulk_coop/bulk_coop_report.rb b/engines/order_management/app/services/order_management/reports/bulk_coop/bulk_coop_report.rb
index 1f658b189a..5c54b492d9 100644
--- a/engines/order_management/app/services/order_management/reports/bulk_coop/bulk_coop_report.rb
+++ b/engines/order_management/app/services/order_management/reports/bulk_coop/bulk_coop_report.rb
@@ -171,7 +171,7 @@ module OrderManagement
           if OpenFoodNetwork::FeatureToggle.enabled?(:customer_balance, @user)
             unique_orders(line_items).sum(&:new_outstanding_balance)
           else
-            unique_orders(line_items).sum(&:outstanding_balance)
+            unique_orders(line_items).sum(&:old_outstanding_balance)
           end
         end
 
diff --git a/engines/order_management/spec/services/order_management/reports/bulk_coop/bulk_coop_report_spec.rb b/engines/order_management/spec/services/order_management/reports/bulk_coop/bulk_coop_report_spec.rb
index f667c8fdc6..0fd9d5d0b5 100644
--- a/engines/order_management/spec/services/order_management/reports/bulk_coop/bulk_coop_report_spec.rb
+++ b/engines/order_management/spec/services/order_management/reports/bulk_coop/bulk_coop_report_spec.rb
@@ -195,7 +195,7 @@ describe OrderManagement::Reports::BulkCoop::BulkCoopReport do
       end
 
       it 'calls #outstanding_balance' do
-        expect_any_instance_of(Spree::Order).to receive(:outstanding_balance)
+        expect_any_instance_of(Spree::Order).to receive(:old_outstanding_balance)
         subject.send(:customer_payments_amount_owed, [line_item])
       end
     end
diff --git a/spec/serializers/api/order_serializer_spec.rb b/spec/serializers/api/order_serializer_spec.rb
index d635cf0ada..4d515d6c7b 100644
--- a/spec/serializers/api/order_serializer_spec.rb
+++ b/spec/serializers/api/order_serializer_spec.rb
@@ -44,12 +44,12 @@ describe Api::OrderSerializer do
       end
     end
 
-    context 'when the customer_balance is not enabled' do
+    context 'when the customer_balance is disabled' do
       before do
         allow(OpenFoodNetwork::FeatureToggle)
           .to receive(:enabled?).with(:customer_balance, order.user) { false }
 
-        allow(order).to receive(:outstanding_balance).and_return(123.0)
+        allow(order).to receive(:old_outstanding_balance).and_return(123.0)
       end
 
       it 'calls #outstanding_balance on the object' do