Credit Memo for Usage Settlement in Oracle Subscription Management

Hello,

We are using usage based subscriptions with estimates added. When the trueup is calculated, we expect

1. if the usage is more than estimate then a new invoice must be generated (for the difference in amount) - This works fine.
2. However if the usage is less than the estimate, we expect that for the difference, a credit memo must be generated.

However we are not able to generate a credit memo.

The system calculates the true-up with the diference correctly (and the amount is negative since the usage is less than estimate). But it is not generating a credit memo, it is generating a invoice again with a negative amount. (The transaction Class is Invoice instead of Credit Memo).