Thanks for your answer.
Do Recurring Free Text Invoices have the capacity to be set up to be recreated in a regular schedule (meaning - get created every year in April, for example?)
That's the key requirement in this case (there are many clients, each client is billed once a year, but on a different month).
and is there a feature for accruing/recognizing revenue in a gradual way for free text invoices? that's the second main requirement in this case (I believe this is quite typical for subscription)