Tracking variations on a fixed-price job

When you bill a job that came from an accepted quote, any manual line you add is auto-logged as a "variation" in the job's variation log. The log captures:

- Description - Amount (net) - Whether the customer has been notified - Optional reason (e.g. "discovered rotten joist", "client requested extra socket")

The Job detail page shows a QUOTED / BILLED / VARIANCE panel — quoted total from the linked quote, billed total from non-void invoices, variance with %.

Click "Mark customer notified" once you've sent the customer an email or a paper note about the variation — the log keeps the audit trail clean.

You can also add manual variations before billing (e.g. customer agreed verbally to extras during a walkround) — handy if you want to log them while they're fresh and fold into the next invoice.