How to use collections strategies in R12 ? Simple example ?

 Hi,

     We need to implement collections strategy for R12 for our customer.

Does someone has already implemented it ?

It would like to know how it works on a simple example as :

- send dunning letter level 1 for all transactions 20 days outdated

- after 15 days of the first level, send dunning lettre level 2 for all transactions still unpaid after level 1

- after 15 days of the second level, send dunning lettre level 3 for all transactions still unpaid after level 2

Thanks a lot,

Regards,

David Stevenard.