Naming Series with Dynamic Date (e.g. MOD-{YYMMDD}) not resolving in ERPNext v15.63+

ERPNext
1

We’re trying to set a custom naming series pattern for the Serial No DocType using the new dynamic date function as documented:
MOD-.{date:YYMMDD}.#####
Our goal is to generate serial numbers like:
MOD-250620-00001
However, the system either:

  • Saves the literal {date:YYMMDD} as part of the name, or

  • Throws an “Invalid naming series” error.

We’re running:

  • ERPNext v15.63.0

  • Frappe v15.69.2

Has anyone successfully used {date} substitution in naming series in ERPNext 15? Is there a different syntax or hidden requirement to make it work?

2

The example is given in “Naming Settings“ DocType.

There is no need to specify date. You need to wrap each side of the date component with a period.

Your desired output should be written as:

MOD-.YY..MM..DD.-#####

This will use today’s date.

If you want to use a specific date field, you’ll have to create a custom field that coverts the date field into YYMMDD format and use that field’s content in your naming scheme using expressions.