Invoice from an Order
Spawn an invoice for the entire Order — all items, in one go. Useful when the work is complete and the customer is ready to be billed for everything at once.
The Order acts as the source of truth: each Order item carries snapshots of pay rate, charge rate, on-costs and tax, captured the moment the item was saved. Spawning an invoice copies those snapshots forward so a later rate change can never retroactively shift an invoice that's already been raised.
The draft invoice is editable — PON, due date, notes, line descriptions and quantities can all be tweaked before issue. Once you click Issue + post to GL, the invoice is sealed: status flips to issued, the next sequential invoice number is assigned, and the journal posts to the ledger atomically. After that, corrections are made by voiding (which writes a reversing journal) and spawning a new invoice — never by editing the issued one.
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