1. Edit the Credit Memo
2. Navigate to Apply tab > unapply the Credit Memo from the Refund
3. Click Save.
4. Edit the Credit Memo again.
5. Mouse over Actions > select Delete
Or Click Void button if user wants to void it. If Void button is missing, please navigate to Setup > Accounting > Accounting Preferences > General Tab > Void Transactions Using Reversing Journals = F