This update prevents errors when Belgian payroll fleet CO2 fees are calculated for multiple vehicles or records at once. It improves reliability for payroll processing involving company cars without changing business rules.

Self can be multi so it bring error when we call _get_co2_fee

Opening the Calendar / Online Appointments menu no longer triggers an unexpected user warning. This lets users view and organize appointment-related calendar events normally, including grouping events by online appointment.

Click on menu Calendar/Online Appointments leads to a user warning

Task 2238100