There is a short way to fix this (#1 below) and a longer way (#2 below).  I always use the longer way.

1a) While still working on the history tab of your vendor, record a payment against the invoice using the Payments button.  In the Vendor Aged Detail report you will see the invoice and a payment against it showing it is no longer outstanding.

1B) Then you can re-enter the invoice with the correct information.  If the invoice number was correct before you will have to enter a space or zero before or period or something like that after to make it accept the new invoice.  The wrong invoice will exist in the file forever.

2a) First do the same as #1a above.

2b) Backup your file

2c) Select Maintenance, Clear Data, Clear Paid Transactions, Clear Paid Vendor Transactions, select the vendor, select the date range and click OK (with historical transactions there is no invoice look up).  This will get rid of the incorrect one you paid and then you can re-enter the correct invoice.

There is a short way to fix this (#1 below) and a longer way (#2 below).  I always use the longer way.

1a) While still working on the history tab of your vendor, record a payment against the invoice using the Payments button.  In the Vendor Aged Detail report you will see the invoice and a payment against it showing it is no longer outstanding.

1B) Then you can re-enter the invoice with the correct information.  If the invoice number was correct before you will have to enter a space or zero before or period or something like that after to make it accept the new invoice.  The wrong invoice will exist in the file forever.

2a) First do the same as #1a above.

2b) Backup your file

2c) Select Maintenance, Clear Data, Clear Paid Transactions, Clear Paid Vendor Transactions, select the vendor, select the date range and click OK (with historical transactions there is no invoice look up).  This will get rid of the incorrect one you paid and then you can re-enter the correct invoice.