When past due invoices are uploaded for the first time into iController, the DIP will automatically be set to 1.
So when an invoice that's 22 days due is uploaded for the first time, there would be a difference between days due (22 in this case) and the DIP (1).
Reason for this is to avoid that an invoice will be directed to a certain procedurestep, without running through the whole procedure. For example: it is not desirable that a debtor receives a second reminder, without ever receiving the first one.