IMPORTANT.  When a Calendar have “New” Status, it CANNOT be used correctly until the corresponding Calendar Counters will not be generated (even if the proper Graphs and optional Exceptions are specified properly)…  When calculation of Calendar Counters will be finished completely, the Calendar Status will be changed automatically to the “Valid” value.  Such Calendar can be used correctly (e.g. for planning purposes).  If list of working hours, Graphs or/and Exceptions will be changed, then the Calendar Status will be changed automatically to the “Invalid” value.  It is VERY IMPORTANT to re-generate Calendar Counters in such cases.