There is no specific option to delete an Over-the-Counter or Work Order invoice. This is due to the fact that there should be no gaps in invoice numbers for auditing purposes. You can, however, empty an invoice or work order if one was entered by mistake. An invoice may also be re-used.
On the invoice/work order, remove any transaction lines from all transaction types. This should leave no transactions, thus when you choose to print and close, the system will alert you to the fact that this invoice/work order does not contain any dollars to be billed and asks if you would like to continue.
If you decide at this point that you do not want to create an empty invoice/work order, answer (N)o.
If you are sure you want to close this invoice/work order, answer (Y)es. At this point the system will print and close the invoice/work order as one with no dollars billed. This, in essence, closes an empty invoice/work order. When the end of day is run the invoice will post as a zero dollar amount.