In order to ensure consistency and accuracy of your ADvendio information, it is not advised to change key, invoice-relevant information once a Campaign Item has been partly or fully invoiced. Certain fields can still be changed once all Invoices for a given Campaign Item are canceledcancelled. For example, you can change an item to Linear Distribution or change payment settings from before/during Billingperiod to After BillingperiodBilling period. However, to change other elements of the Campaign Item, such as Quantity or Discounts, please use the Optimizer.
...