A downgrade order for the resource was placed, but it does not have any order details.
The subscription period, the subscription is based on, is configured not to give any refund to the customer:
Home> Product Director> Plan Manager> Service Plans> # PLAN ID > Subscription Period # ID Full Refund Period (days) 0 After Refund Period No Refund
The order details refer to financial order details (the sum the customer is charged or refunded). In this case there are no financial operations, therefore no order details generated.
If you need to see what resource was downgraded, you may refer to the Provisioning Items tab.