...
Posted Invoice Count: represents the number of posted invoices.
Cancelled Invoice Count: represents the number of cancelled invoices.
Invoice Count: represents the number of created invoices, but not yet posted invoices
...
Note: In case there are all payments invoiced in payment calendar and user clicks on button Calculation, payment calendar cannot be recalculated. Instead, there is displayed message: “There must exist at least one line where Rel<>0.” In case of interest model: “Number of payments not invoiced is lower than 1.”
Follow up:
How to create calculation in general
...