code: private static void updatePersonAssignmentData(final PersonAssignmentData exist, final PersonAssignmentData update) {
  
  		final List<AssignmentData> assignmentList = update.getAssignmentList();
  
  		for (final AssignmentData assignmentData : assignmentList) {
  			updateAssignmentData(exist.getAssignmentList(), assignmentData);
  		}
  	}
docs: Update person assignment data.
  
  @param exist  the exist
  @param update the update