I need to post a partial payment made by a company credit card on an already posted vendor invoice w/o double posting when the cc statement comes in.

I have an bill posted for a vendor. We paid a partial payment with a credit card yesterday. I need to post that payment to the vendor invoice to lower it but I don't want to double post the expense when the credit card statement comes in. How can I post payment without having to indicate a bank source because technically it won't come out of the bank till the credit card statement shows up next month to be paid.