Typing one in

Not everything billable is an hour. A fixed fee, three doors supplied and fitted, a call-out charge, materials at cost — you type it, it waits, and it goes on an invoice when you pick it.

⛔ This is the reason the pack does not require the time log. invoice-book was, briefly, only able to invoice logged hours — which made an invoice book that could not invoice most of what a trade or an agency actually bills for.

⚠ Pending is a real place, not a staging trick. An item you typed and did not invoice this week is still there next week. That is the whole point: the thing you scribble down before you invoice is precisely the thing that gets forgotten.

⚠ quantity and unit_price are for reading only. The amount is what gets invoiced — if the two disagree, the amount wins, because it is the number you decided on.

A negative amount is a credit

A cash voucher, a goodwill discount, a returned part: type it with a minus and it comes off the invoice it lands on. Same pending list, same pick-and-invoice flow — a credit is not a special kind of document here, it is a line with a minus.

⛔ The floor moved from the ITEM to the DOCUMENT. This recipe used to refuse anything not greater than zero, which also refused every voucher. The constraint that actually matters was never about the line — it is that an invoice cannot total zero or less. issue-invoice holds that now, and it is the right place: a credit is only meaningful net of the charges beside it.

⚠ Zero is still refused. A nil line bills nothing and credits nothing, and reads as an unfinished entry.

⚠ VAT does not follow it. VAT is a number you type on the invoice, so if a voucher reduces the VAT-able base, reduce what you type. The pack records tax, it never computes it.