Let's see how we can change the sequence number for Invoice
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Please follow the path, Settings > Invoice Customization
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You will see following options:
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1) Daily reset sequence Number: If the transaction volume for invoices is high, the daily reset sequence is helpful. The by default prefix to the number will be the date for transaction.

2) Manual Numbering: In this option, you can enter your own numbering manually. Kindly ensure that the numbering is unique for each invoice.
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3) INV Prefix followed by sequence number: This is the most preferred way of invoice numbering. The sequence number will be generated by system in progressive manner.
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4) Custom Prefix & Suffix: With this option you can add Prefix of your own choice.
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​Indian users are required to follow GST rules for Invoice numbering. The 4th option number system is complying with GST rules in India.
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You can also read How you can choose and customise Invoice Templates.
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