After ACS(check-in system) initialized for a specific flight and if the schedule changes during this time the checked in passengers were offloaded by the system.

The schedule change was run during the check-in period, causing damage to all check in data. It is imperative to delete and reinitialized the flight after any schedule change perform during the ACS period.

Please, make sure to remove the flight and reinitialize it after any SC run to a flight that has already been initializing in check in. Schedule changes during the ACS period are not recommended as it usually leads to problems.