About voiding receivable invoices
If you discover an invoice was entered incorrectly, determine the best method to correct the error. For example, if the error is in the header information, you can edit the information contained in any of the text boxes,
When the invoice contains an incorrect job number,
There are also circumstances when you cannot void the original record. For example, you cannot void a credit invoice that has been applied in full, or an invoice posted to period 0. Because you cannot void these types of transactions, it is necessary to enter an adjusting invoice.
Important! Before voiding an invoice, reverse all the payments posted to it. You can then enter the invoice correctly and reapply the payments.