Why does Zoho FSM show an "Appointment Conflict with Ongoing Appointment" error even when the scheduled dates are different? What does it mean?

Why does Zoho FSM show an "Appointment Conflict with Ongoing Appointment" error even when the scheduled dates are different? What does it mean?

This error appears when the Scheduled Start and End Time of a new appointment overlaps with any existing appointment assigned to the same service resource or equipment—even if the dates differ.
By default, Zoho FSM does not allow overlapping appointments for a field agent or equipment. To override this, you must enable the Allow Overlapping Appointments setting.
​To enable overlapping appointments in Zoho FSM:
  1. Go to Setup > Field Service Settings > Transaction Settings.
  2. Scroll to the Appointment Scheduling Preferences.
  3. Enable the toggle for Allow Overlapping Appointments.
  4. Choose one of the following options based on your preference:
    1. Allow Overlapping without Warning: Appointments can be scheduled without any warning, even if they overlap.
    2. Allow Overlapping with Warning: The system shows a warning with the list of conflicting appointments, but still allows the scheduling.

Also enable overlapping timesheets (if needed) :
Enabling Overlapping timesheets allows field agents to track multiple jobs at once or multitask across appointments
  1. Navigate to Setup > Field Service Settings > Transaction Settings
  2. Under Time Sheet Settings, enable Allow Overlapping or Concurrent Timesheet Entries