Sales: Credit Note

Hello,

Since changing over to the new version of MYOB I can no longer create a simple credit note. 

I don't need to create a customer return, I just need a credit note. This is because a customer has paid using a card, meaning the invoice amount is higher than the amount received to the bank account due to the card processing fee. I am therefore unable to match the invoice to the amount received until a credit note is created. 

Has anyone else encountered this issue? If so, how do you fix it/get around it? 

Thanks in advance!