AP: How to capture over payment returned by vendor via check ?

Hi,

Our AP staff created incorrect voucher for one of the vendor and ended up paying more than what was on original invoice. Now vendor has mailed excess payment via check.

How can we capture this check payment in system so that system correctly updates vendor balance and also payment made to this vendor ? .

There are no open vouchers for this vendor and there won't be any open voucher for this vendor in near future. I would like to know if there is a way to capture this vendor credit in a way that it will show excess payment made to client as credit to cash account and it will also update vendor balances.