Cancel a proforma Invoice

Several users created proforma invoices referenced to a sales order. Now we need to delete the order but because a subsequent document (proforma invoice) exist, we cannot delete the sales order. Does anyone know how to get around it?

If you want to cancel a proforma invoice, goto Tcode VF02, enter your proforma invoice number.

Click on the menu (1st menu item).

Then confirm.

After you confirm the proforma invoice, the status of the proforma invoice will become Cancelled.