About voiding payable invoices
If you discover an invoice was entered incorrectly, you need to determine the best method to correct the error. For example, if the error is in the header information, you can often correct the error by editing that information.
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.
Before voiding an invoice, however, you need to reverse all the payments posted to it. Then you can enter the invoice correctly and reapply the payments.