Unfortunately the client does not have the Jobs module and currently they are on 3.7. I know that Simcrest has a recurring sales invoice add-on, but unfortunately we have not bee able get a price from them.
Basically, we are looking for something with the same functionality as the recurring payable journals (start date, end date, fixed or variable amounts, and a formula for how often these entries occur (1M, 1Q, etc)). These would also need to populate the invoice header and line table to create the actual invoice.
Thanks