# Recurring invoices: `series_id` is optional

Creating a recurring invoice without `series_id` no longer answers `VALIDATION_ERROR`: the template uses the company's default series for `invoice_type`. A `STANDARD` template with no default standard series is rejected with `SERIES_DEFAULT_NOT_FOUND`.

Oct 26, 2026 · Improved

Creating a recurring invoice without `series_id` no longer answers `VALIDATION_ERROR`: the template uses the company's default series for `invoice_type`. A `STANDARD` template with no default standard series is rejected with `SERIES_DEFAULT_NOT_FOUND`.

## Where to go next

- [Recurring invoices](/guides/recurring-invoices)
- [Create a recurring invoice](/recurring-invoices/createCompanyRecurringInvoice)

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