It is possible that a customer makes multiple appointments on the same day. If you checkout from the calendar, all appointments will be grayed out, but not all treatments are included in the bill! The problem now arises that the 2nd appointment can no longer be settled from the calendar.
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We solve this by settling customers with multiple appointments on the same day from the register:
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1. Don't checkout from your calendar, but directly from checkout

2. You will see the bill amongst 'customers of today'
3. Click on the account and you will see all treatments in one bill
4. After checkout, all appointments belonging to the same customer's name are now grayed out in the calendar