Hi Cindy Thompson ,

Please attempt the following:

1. Reverse the Payment:
   1. Open Bank Services -> Bank Transactions -> Reverse Transactions.
   2. Select Accounts Payable -> adjust the filters to narrow down the Payment and click the go button.
   3. Select the Payment you wish to reverse.
   4. Ensure the dates are set to the same date the original payment was made.
   5. Process the reversal.
   6. The original invoice entered against the wrong supplier is now fully outstanding again.
2. Credit note out the incorrect invoice
   1. Enter a Credit Note against the invoice for the incorrect vendor - same dates, same expense accounts, same tax, identical.
3. Enter a new original invoice against the correct Vendor as originally intended.
4. Enter the payment against this new invoice.

Commonly people ask "Why can't I just delete the payment, delete the incorrect invoice or edit the payment and invoice to a different vendor?  Why do I have to go through this cumbersome process?"  The answer is this system is designed for a particular market segment - the auditors of our clients would have a heart attack if a system allowed a user to do this.  Our clients require segregation of duties - where different parts of the process are handled by different people, and a trail that can be followed showing the process undertaken to correct the issue.  If this becomes a common issue that can't be resolved through training, you might consider implementing an A/P workflow module to introduced a forced review/approval process for invoices.