A new native invoice can receive its number when you save, or you can enter your own unused number. The invoice-number field explains which behavior applies. For a saved draft, review the existing number before replacing it with another reference.
Use a numbering convention that the company can follow consistently. Check the existing document history when importing a reference from another system so the new invoice is not confused with an already recorded customer obligation.
An invoice number identifies the document; it does not establish that the invoice is issued, emailed or paid. Read the saved status alongside the number when checking whether work has completed. A numbered draft can still need customer, account or tax review.
If the source terms came from an accepted estimate or recurring schedule, preserve the connection to that source when reviewing the number. Do not create a second invoice solely to obtain a different display reference without checking the original document's state and the supported correction workflow.
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