I am trying to update Order.IsReductionOrder to true from a trigger but getting below error.
Field is not writeable: Order.IsReductionOrder
It looks like field is read only from Order documentation
Any workaround please
IsReductionOrder is writeable on create, but read-only after create. It somewhat makes sense from a business process perspective, an order either is a reduction order or it's not, it shouldn't ever start as a normal order and then become a reduction order.