If a bill is incorrect it can be voided, this will remove it from all financial reports.
However, if a bill has been included on a VAT return you will not be able to void this invoice unless you delete the return. You can instead reverse the bill by applying a credit note against an unpaid invoice or by creating a refund to negate a paid invoice.
To learn how to re-instate a voided bill, please click here.
Navigate to Purchases > Bills and, if necessary, select the All filter, to find the bill that needs to be deleted.
Click on the bill number of the invoice that you would like to void.
Click on the Void button and confirm when prompted.
All voided bills are listed in the Void tab under Purchases > Bills.