Every document type takes its number from a series at the moment it is created. Getting the format right at the start saves reissuing documents later, because a number that has been given to a customer should not change.
Steps
- Go to Settings → Numbering.
- Pick the document type — quotation, sales order, invoice, credit note, purchase order and so on.
- Set the prefix, for example
INV-orINV/25-26/. - Set the starting number and how many digits to pad to.
- Choose whether the series resets each financial year.
- If you have more than one branch, add a series per branch.
- Save.
Numbers are taken when the document is created, not when it is saved. That is what prevents two people ending up with the same invoice number, and it means a cancelled draft leaves a gap. A gap is normal and defensible; a duplicate is not.
Common formats
INV-0001— simple, resets yearly.INV/25-26/0001— carries the financial year, which auditors like.PUN/INV/0001— carries the branch.
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