Document number
Also called Invoice number · Operator invoice number · Sequence
TL;DRThe customer-facing invoice identifier, allocated from a per-organisation sequence when the document is finalised.
Sonic keeps an internal id for every invoice and a separate operator number built from a template — prefix, year, a counter — that is what the customer sees. The counter only advances when a document is finalised, so drafts do not burn numbers.
Bulk actions decide numbering order across the whole selection before any counter moves, so priority rules such as earliest period first hold. Custom fields with their own sequences follow the same rule.
Where it happens in Sonic
Next
See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.