Dunning Letters at Invoice Level and with With 3 level warnings.

Hi Dear,

Our customer needs to implement AR Dunning Letters . They want to use Advanced Collections without license. Their requirements are given as under:-

1. Send dunning letters for each delinquent invoice.
2. Run the dunning program every month.
3. Invoice should not appear in dunning letter if this invoice overdue date is less than 30 Days. (Which means they want to allow 30 Days as Grace Period above due date).
4. Each dunning letter should contain a single invoice. So if the letter is sent first time for any particular invoice and it remains  due till the next run , then the template for the dunning letter should be different ( In terms of subject and moderate wording) for this invoice, and if it  still remains  due for the 3rd time run then different template (with hard wording). If a single customer has 5 overdue invoices then there should be 5 separate letters generated.