Numbering sequences: identifiers people can read — Tips
• Put the year in the format and reset yearly — INV-{YYYY}-{####} keeps numbers short and sorts sensibly forever.
• Set allocation to on transition and point it at the state that means "this is real now" — usually the first Active state.
• Give each sequence a name that says which records it catches; the name is what the configuration list shows when several share a field.