How to fix ‘The Invoice Number has already been taken’ error

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The app requires that all invoices and quotes (even deleted ones) have a unique invoice number.

There are a few ways to resolve this error:

– Restore the deleted invoice, change the invoice number to a value you won’t use and then delete it again.

– Purge the client to fully delete the invoices.

– Purge the company on Settings > Account Management to fully delete all invoices.

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