Merge command: [strcalendar-boxnronlastpage ]
Merge variable/item: nronLastpage

Comments:
This calculates the calendarbox number value in (fictive) case of generation the last box. The value can in practice be used as a `calendartart` parameter, in a url, to jump directly to the last available calendar box.

Formula:
@Abs(startnrStartpage-nrTotal-1);