This is also known as 'reversing a credit application.
How do I detached a credit from invoices?
1. In the Customer invoices section of the customer's profile, open up the credit your want to detach.
2. Expand the 'Credit Application' section
3. Click on the star in the top right hand corner
4. Click the green 'Yes' to the pop up question on if you want to reverse the credit application
This will remove the credits attached to all invoices and then allow you to void the credit or re-allocate the credit to another invoice if need be.
How do I void a credit?
1. In the Customer invoices section of the customer's profile, open up the credit your want to void.
2. Scroll to the bottom of the screen and click on the red 'Void' button.
3. A pop up window will appear asking if you are sure you want to proceed. Click on the green 'Yes' button.