it would really be helpful to have an option to cancel an invoice. my customers have 24hours upon receipt of invoices to pay. we give about 3-5 days extra on top of that. if the invoice is not paid we cancel it. if i have to cancel an invoice i would simply just delete it but that doesnt work either because once the invoice is deleted, on the customers side it does not show the invoice but still gives them the option to pay it. so this puts me having to go into every single invoice to 0 out the amount which takes a great amount of time!