Check applied to invoice has been lost in transit, how can I void it

Hi

We have a situation where we paid an invoice by check and that check was applied to the Vendor, now we have heard the check was lost somewhere in transit and we need to void the original check and raise a new one.  If I try to void the check the message shows that it is not outstanding.
Please can anyone let me know the best way to achieve this in SL7.

Thank you