I do have a feature request for this software because I thought it was something very useful from invoiceninja. They can use shortcodes in their product descriptions in the recurring invoices, with simple math. Let me give you an example:
- Renewal of your domain name for #YEAR (or #YEAR + 1)
- Computer maintenance for month #MONTH - 1
The #YEAR (or #MONTH, #QUARTER, etc…) would then of course convert to the correct values. This makes it easy to have comprehensive line items without having to edit your recurring invoices. What do you think?