Recently we changed something about adding iCals. You have to provide a default Check-in and Check-out time from now on. We do not import actual check-in and check-out times of the guest, so we set a default. This was confusing to many users so we changed this to allow users to set their own default times.
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If you added your iCals before we released this change you will see this error:
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You can leave it like this, but be aware that the check-in and check-out times in booking details is the random default set by Properly and is not the actual check-in/check-out time of the guest.
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If you'd like to update this to get rid of the error message you have to disconnect the iCal and re-connect it. The moment you disconnect the iCal all bookings will disappear from your calendar and when you re-connect the iCal all bookings will import again. These are created as new bookings and will generate new check-in and check-out events in the calendar. So if you have already scheduled some jobs on the check-out don't forget to remove the additional orange Check-outs in the calendar. You can remove them by clicking on them and then selecting Ignore.