Invoicing & payments
Marking an invoice as sent
What freezes, and what the app does not do.
Mark as sent is a status you set after you have actually sent the PDF. The app never emails anyone — you download the file and send it however you normally do.
WHAT FREEZES
Once sent, the line items and totals cannot change, the payment terms are fixed, and the time entries and expenses behind the invoice lock. A PDF is archived exactly as it stood at that moment.
This is enforced in the database, not just hidden in the interface. Once a client holds a copy of an invoice, the hours and rate behind it must not quietly change — that is the whole basis on which an invoice can be defended later.
WHAT YOU CAN STILL DO
Record payments, turn on follow-up reminders, re-download the archived PDF, and view the payment history.