Hi, Tgal,
Do you have cheque reconciliation enabled in your Company Profile?
If so, select Payments | Check Reconciliation from the menu. Highlight both of the cheques that were mistakenly issued, right click and select Reversed. Then, Post the transactions.
The invoices will be reset up in the Vendor records and the appropriate journal entries will flow through to the GL.
Note: When you upgrade to and install AP8.1B and reverse a cheque, you'll be able to choose which status date you want saved with the reversed cheque - the login date or the original cheque date.
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Regards,
Softrak Tech Support