Credit memo for partial adjusted Event

Summary:

We have a requirement from Business to have credit memo generated from Contract. We adjust the event amount and in case of adjusting the event amount to 0 the credit memo generated however when we partially adjust the event amount in that case the credit memo is generated for the full amount and new invoice is create for the new amount.

Issue;-

Business needs only the credit memo for the adjusted invoice as they need to issue a credit note to customer than a new invoice with a reduced amount.

Could you please help if there is any process to raise credit memo for adjusted amount.