The original bill is not edited. It is voided and stays on the account permanently, and a new correction bill replaces it. Both remain visible to the customer and to an auditor.
Only a bill that was actually issued can be corrected — a held-then-voided draft was never a document, so there is nothing to replace.
Stored on the void permanently with your name and the time the database stamps it.
This is a regulatory choice, not a technical one. It is recorded against the correction before the rebill runs.
What the voided bill charged
PGA $0.41200/therm — December's factor, carried forward. When this bill ran on Apr 16, 2025, no January version had been recorded at all, and the run used the neighbouring month rather than stopping.
The January factor was not recorded until —, six weeks into the period it applies to. A lookup that finds nothing at a coordinate now raises instead of falling back — which is why this is a correction rather than a silent edit.
A correction cannot be produced outside a correction run. The run carries the default rate mode; your election above is recorded per target and overrides it.