Need help correcting a posted Invoice

Hello,

So I've tried doing some research but it seems there are many answers and I'm not sure which is the correct one.

THE PROBLEM

I posted an invoice and applied a payment (paid with check) through the Purchasing Module - Please keep in mind this is an invoice that contains inventory.  Later on I realized that I had entered the wrong invoice number.  So I went and VOID HISTORICAL TRANSACTION and then VOID OPEN TRANSACTIONS.

FIND A SOLUTION?

This is where I'm stuck, how can I correct the invoice number when I get to this point? Someone suggested creating a credit memo or return transaction entry.

Any help is always well appreciated. Thanks