Data records are broadly classified as “Master” or “Transaction”. A master record is a record that has a “name”, for example a Customer, Item, Supplier, Employee etc. A Transaction is a record that has a “number”. Examples of transactions include Sales Invoices, Quotations etc. You make transactions against a number of master records.
ERPNext allows you to make prefixes to your transactions, with each prefix forming its own series. For example a series with prefix INV12 will have numbers INV120001, INV120002 and so on.
You can have multiple series for all your transactions. It is common to have a separate series for each financial year. For example in Sales Invoice you could have:
etc. You could also have a separate series for each type of Customer or for each of your retail outlets.
To setup a series, go to:
Setup > Customize ERPNext > Numbering Series
In this form,
You can also update the starting point for a series by entering the series name and the starting point in the “Update Series” section.