We need to run this by pro forma users. They may instead expect this invoice to be voided, and a separate invoice created for other items on the invoice.

Also, I think this is blocked by CORE-1479.

After discussing briefly, the BEST option is to void the existing invoice, and create a new invoice with the remaining line items. Adding a credit is just going to cause confusion. Voiding works in both pro forma (if the invoice is a pro forma invoice) and non pro forma cases.

Perhaps we should have an option to void previously unpaid invoices as well? We could wrap it all up into a single setting:

Void Open Invoices on Cancellation

• Only if the invoice is not due
• Always

Questions

• What if the invoice has other line items on it?
  • Answer: Create a new invoice with remaining line items.
• What if the invoice has a partial payment?
  • Answer: Unapply the payment(s) and re-apply those payments to the new invoice (if created)

Discussing this, it sounds like we need:

1. A company/client group setting, enabled by default, to remove line items from invoices not yet due.
2. When cancelling the service, unapply payment.
3. Remove the line item.
4. Re-apply payment.

If this results in no line items, void the invoice entirely.