In effect: an invoice is paid or revenue sits in a closed period, so line items are read-only. Amend the contract to change them.
The invoice schedule: Unbilled invoices wait for their invoice date (send them, or let invoice automation send them).
| Invoice Number | Status | Invoice Date | Due Date | Billing period | Amount | Amount Due |
|---|---|---|---|---|---|---|
| INV000000337 | Paid | 04/01/2026 | 05/01/2026 | 04/01/2026 – 03/31/2027 | $144,000.00 | $0.00 |