Billing is an action on the project, taken by someone holding the bill projects permission. You choose a date range; the application gathers the project's entries that are approved, billable and not yet billed in that range, and builds one draft sales invoice to the project's customer:
- Each entry becomes a line for its regular hours, and — where overtime was logged — a second line for the overtime hours, priced at the rate times the company's overtime multiplier. The lines sell the project's service product, in hours, and VAT is calculated as on any other sales line.
- The invoice's narrative lists what it is charging for, entry by entry — date, person, hours, description — which is why entry descriptions are written for the client's eyes.
- The entries flip to billed and lock: a billed entry cannot be edited or deleted. Each entry keeps its link to the invoice line it became.
The invoice is a draft: from there it lives the ordinary sales life — checked, approved, posted, sent — under Chapter 3's rules, and Chapter 3's permissions.
If the invoice never happens — it is voided or deleted, or a line is removed from it — the entries it carried are released back to approved, ready to be billed again on a corrected invoice. Billing is also refused, by name, where there is nothing to bill, where the project has no service product, or where the project is non-billable: the refusal says which, rather than producing an empty or wrong invoice.