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While exporting the Schedule appointments as an ICS file, each appointment UID varies on each exporting. Due to different UID values generated for the same appointment on each exporting. While importing the ICS files with the same list of appointments but a different UID to the Schedule, it will create duplicate appointments in the Schedule.
Ex: We have two ICS files one has an appointment named meeting with UID 1 and in the other ICS file the same appointment with the UID value as 2. So, while importing both files to the Schedule it will create two appointments with the named meeting.

Need to provide the same UID for the appointments on each export.