OLATResourceable resourceable = getResourceable(calendarType, calendarID);
NarrowedPropertyManager npm = NarrowedPropertyManager.getInstance(resourceable);
Property tokenProperty = npm.findProperty(identity, null,
PROP_CAT_ICALTOKEN, PROP_NAME_ICALTOKEN);
if (tokenProperty != null) {
npm.deleteProperty(tokenProperty);
}
} else {
PropertyManager pm = PropertyManager.getInstance();
Property tokenProperty = pm.findProperty(identity, null, null,
PROP_CAT_ICALTOKEN, PROP_NAME_ICALTOKEN);