Entering credit card processing fees

My credit card processing company withdraws a fee from my business checking account at the beginning of each month based on the credit card transactions from the previous month. In the past I have entered these withdrawals as "Credit Card Processing Fee" with no problems. When I try to do the same entry now I get a warning that which says "Please choose a credit card to pay" but I am not making a payment on a credit card. I am just trying to record the payment which has already been withdrawn from my checking account.