How do I correct a buyer’s bill if the sale price is wrong or we sold the lot to the wrong buyer?

If you have to make a correction after you issue the buyer invoice, you must Void the invoice first.  Then, from the same billing screen you can Prebill, View and Edit the Prebill. This will let you change or delete any of the sales to that buyer. Once you’ve made the correction, you’ll come back to the billing screen where you can issue a new invoice.