If you need to make an edit to an existing meeting that was imported from Oracle Calendar it is best to delete the meeting and recreate the meeting with the changes you need to make and re-add the invitees. Changes to meetings could include: changing the date, time, location, adding or removing attendees. If there was a list of attendees that existed in that imported meeting you must add the invitees to the new meeting and send out an appointment or meeting request. Make sure to notify the invitees of the changes to that meeting so they can make the appropriate changes to their calendar. They will have to delete the imported meeting on their calendar and accept the new meeting request with the changes the organizer made.