Andrea has been a bookkeeper for 10 years. She regularly controls the outstanding payments, as well as the dealership's financial performance and status. At the end of each fiscal period, she is also in charge of closing financial periods and books. Today Andrea needs to check outstanding payments. Having found service invoices still open for more than one month, she needs to take action. She would like to call a few loyal customers in person, while for others, a polite reminder via e-mail will suffice.