In some cases there might be the need to correct an order – when it was created with wrong details or prices. This can happen, for example, due to billing errors:
Some APS applications have their own billing logic implemented, and report the usage to Billing not as a resource amount, but directly as its money equivalent. So, if a miscalculation happens on the side of such an application, there is a need to correct the respective billing order in Billing.
Example:
An application reported the 30 USD usage while the actual usage was 25 USD. The respective billing order should be corrected (25 instead of 30).
It is possible to correct an order even if it has the Completed status and the respective service has already been provided.
Technically, a provider can correct an order by issuing a credit or a debit memo, but in some cases this can be inappropriate from the accounting point of view.
Fixing an incorrect but already provisioned order should be performed by creating a correction to it. In this case, a change order is created, and the system keeps the relations between order details in this correcting order and the details in the order it corrects.