Hi Stefan,

I have investigated the behavior of ProjectCalendar.ToExceptionsXml() method, and I have asked our engineering staff to examine this further.  To ensure that it will receive attention, I have logged this behavior in our internal tracking system with a Development ID of 242070. This will be assigned to a developer in a future sprint to review my investigation and confirm my findings or to offer a fix, or other resolution.

In the meantime what I can suggest as a workaround in order to properly save the ProjectCalendarExceptions is to use a combination of ProjectCalendar.ToExceptionsXml() and DateRecurrence.ToICalendarString() methods. The second method would save the rules properly so they can be restored and reassigned to the ProjectCalendarException instance later. A very simplified implementation of the suggested approach should look as follows:

List<DateRecurrence> dateRecurrences = new List<DateRecurrence>();

foreach (var recurrence in recurrences)
    dateRecurrences.Add(DateRecurrence.FromICalendarString(recurrence));
var projectExceptions = ProjectCalendar.FromExceptionsXml(strExceptions); 
for (int i = 0; i < projectExceptions.Count; i++)
{
  projectExceptions[i].Recurrence = dateRecurrences[i];
}

Please let me know if you need more information.

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