How to disable auto deduction on credit upon invoice generation

[tomcatf14]

I need help to disable auto payment from the customer's credit upon invoice generation. I believe the correct way to deduct the credit from client's account is when the client or the administrator apply the payment instead upon invoice generation.

 

Some client might not want to renew the domain/services anymore but the invoice will still be generated. I might be lost here, any advise would be appreciated.