Updating line items through admin controller causes enterprise fees to be recalculated

app/controllers/spree/admin/line_items_controller_decorator.rb

@@ -1,8 +1,11 @@
 Spree::Admin::LineItemsController.class_eval do
   prepend_before_filter :load_order, except: :index
+  around_filter :apply_enterprise_fees_with_lock, only: :update
 
   respond_to :json
 
+  # TODO make updating line items faster by creating a bulk update method
+
   def index
     respond_to do |format|
       format.json do
@@ -16,8 +19,16 @@ Spree::Admin::LineItemsController.class_eval do
 
   private
 
-    def load_order
-      @order = Spree::Order.find_by_number!(params[:order_id])
-      authorize! :update, @order
+  def load_order
+    @order = Spree::Order.find_by_number!(params[:order_id])
+    authorize! :update, @order
+  end
+
+  def apply_enterprise_fees_with_lock
+    authorize! :read, @order
+    @order.with_lock do
+      yield
+      @order.update_distribution_charge!
     end
+  end
 end