The same service, the next period
A retainer, a software subscription, or a flat maintenance fee has the same lines, the same customer, and the same payment terms every month. Recurring invoices store exactly that: interval, term, and the preset for subject, texts, and line items.
You set this up under Service as a maintenance contract with contract type invoice. Jupiter ERP checks hourly whether a period is due and creates the invoice. On demand you use Create next invoice, without waiting for the next run.


