I've made a promotion rule under
Promotions > Shopping Cart Price Rules. It enables free shipping for shopping cart less than 2 KG.
Total Weight equals or less than 2.
Free shipping -> For shipment with matching items
I enabled Flat Rate shipping method with price of 10$ as well.
Customers can see the free shipping option in checkout page, and admin user can create a new order with free shipping from admin panel. But when admin user tries to reorder, Flat Rate price is 10$ and the promotion did not apply. See screenshot below:
Is it possible to apply the promotion in this situation?